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Giải pháp thiết kế văn phòng hackerrank python

Ngày đăng: 23/12/2022
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Cho một số đoạn đầu vào và mỗi đoạn có 2 ô ở hai bên đường. Tìm tất cả các cách có thể để xây dựng các tòa nhà trong các lô đất sao cho có một khoảng trống giữa 2 tòa nhà bất kỳ

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    Ví dụ.  

    N = 1
Output = 4
Place a building on one side.
Place a building on other side
Do not place any building.
Place a building on both sides.

N = 3 
Output = 25
3 sections, which means possible ways for one side are 
BSS, BSB, SSS, SBS, SSB where B represents a building 
and S represents an empty space
Total possible ways are 25, because a way to place on 
one side can correspond to any of 5 ways on other side.

N = 4 
Output = 64

    https. //luyện tập. chuyên viên máy tính. org/problems/count-how-possible-to-build-buildings5007/1

    Chúng tôi thực sự khuyên bạn nên thu nhỏ trình duyệt của mình và tự mình thử tính năng này trước
    Chúng tôi có thể đơn giản hóa vấn đề để trước tiên chỉ tính toán cho một bên. Nếu biết kết quả của một cạnh, chúng ta luôn có thể thực hiện bình phương của kết quả và nhận được kết quả cho hai bên.

    Một tòa nhà mới có thể được đặt trên một phần nếu phần ngay trước khi nó có không gian. Một khoảng trống có thể được đặt ở bất cứ đâu (không quan trọng phần trước đó có tòa nhà hay không)

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)

    Dưới đây là triển khai ý tưởng trên.  

    C++




    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    18

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    19

    ________ 620 ________ 621 ________ 10

     

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    1

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    2 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    3
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    2 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    5

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    6

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____18

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____120 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    21

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    23 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    24
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    25

     

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____127

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____129

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____231

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____233

     

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____235

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____12 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    38

     

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____320

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____322

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7__
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    24 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    25
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    2 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    27

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    6

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    31

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    33

     

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    35

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    37

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____439

     

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____6181

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____6183

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    2 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    186

     

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____6188

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____123 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    191

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    39

     

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    193

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    2 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    195

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    6

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____12 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    199

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____6201____6202 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    203

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    204
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    205
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    206 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    207

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____123 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    210

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    39

    Java




    ________ 6212 ________ 6213

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    214 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    215 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    216

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    6

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____11

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    01 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    2 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    3
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    2 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    5

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    6

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    8

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    20 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    12____113
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    14

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    15
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    23 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    17
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    18
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    25

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    20

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    27

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    29

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    31

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    33

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    20

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    35

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    2 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    34
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    13
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    36
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    13
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    38

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    20

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    20

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    24 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    25
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    2 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    48
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    49
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    50

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    6

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    15
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    31

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    15
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    33

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    20

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    15
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    35

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    15
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    37

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    39

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    20

    _______122____6181

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22____6183

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    2 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    186

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    20

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22____6188

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    23 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    191

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____439

     

     

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____6214 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    01 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    83 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    84

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    6

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    2 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    89
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    90
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    91

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    93____6202
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    95
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    206

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    97____198

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____439

     

    _______439____1202

    Python3




    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    203

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    204

     

     

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    205

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    206

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    207 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    208

     

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____1210

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    20 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    213
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    214
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    214 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    13
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    217

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22____1219

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    221

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    23 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    17

     

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____1226

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____1228

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____1230

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____1232

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____1234

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____1236

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____1238

     

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____1240

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____1242

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____1244
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    214
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    13

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____1248
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    214
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    13

     

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____1252

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____1254

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____1256

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7_______324 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    259
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    260 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    261
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    25
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    49
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    264
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    265
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    13
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    217

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    270
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    214 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    244

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    274
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    214 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    248

     

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    248
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    214 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    270
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    265 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    274

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    244
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    214 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    274

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7

     

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____1289

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____1291

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____1293

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____1295____1214 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    248
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    265 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    244

     

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____2301

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____2303

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____123 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    306____2307
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    308

     

     

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    309

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    20 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    311
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    214
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    214 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    314
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    315

     

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____2317
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    214 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    90

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____2321 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    25
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    323
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    324

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    326____2327 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    328

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    330

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    331

    C#




    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    332

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    333

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    334

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    20 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    336

     

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    215 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    338

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    6

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____2341

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____2343

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    01 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    2 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    3
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    2 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    5

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    6

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    8

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    20 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    21

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    15
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    359

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    15
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    361

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    15
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    23 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    364

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    367

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22____2369

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22____2371

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22____2373

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    375

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    377

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22____2379

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22____2381

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22____2384

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    386

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    2 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    389

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    15
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    391

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    394

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    396

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22____2398

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22____3200

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    24 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    25
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    2 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    205

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    6

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    15
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    31

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    15
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    33

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    15
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    214

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    215
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    216

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    15
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    37

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    39

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22____3223

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22____3225

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22____6183

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    2 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    186

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22____3233

    _______122____3235

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22____3237

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    23 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    240

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____439

     

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____3244

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____6214 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    01 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    83 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    249

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    6

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    2 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    199

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22____3256

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____439

     

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    39

     

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    260

    PHP




    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    261

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    262

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    263

     

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    341

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    343

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    266 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    3____3268
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    14

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    6

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____18

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    20 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    25
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    268 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    278

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    359

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    361

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    23 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    364

     

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____2367

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____3290

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____3292

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____3294

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____3296

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____3298

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____233

     

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____2384

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____2386

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____4306 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    307
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    308 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    307

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____4311
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    91
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    313
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    91

     

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____2394

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____2396

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____2398

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____3200

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7__
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    24 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    25
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    326 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    327
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    326 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    329
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    268
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    91
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    326
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    333

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    6

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    311 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    214
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    306
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    91

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    313 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    214
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    308
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    91

     

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    308 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    214
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    311 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    265

    _______4351____4313

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    91

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    306 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    214
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    313
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    91

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____439

     

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____4362

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____4364

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____4366

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____4368

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____4370 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    214
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    308 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    265
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    306
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    91

     

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____4377

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____4379

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____123 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    25____4370
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    307
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    370
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    386

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    39

     

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____3244

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____3268 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    392

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____4394 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    202 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    326
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    268

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    398
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    326____6206 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    1801
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    268
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    386

     

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    1804

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    1805

    Javascript




    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    1806

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    1807

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    1808

     

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    1

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    266 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    1811

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    6

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____18

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____120 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    21

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    359

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    361

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    23 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    24

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    1826

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____127

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____129

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____231

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____233

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    1826

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____235

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____61839

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    1826

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____320

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____322

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____324
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    1847

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    6

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    31

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    33

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    1826

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    35

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    22
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    37

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____439

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    1826

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____61863

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____61865

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____6183

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____61869

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    1826

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____4377

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____4379

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7____123 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    191

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    39

     

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    1879

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    199

     

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    1881____6202 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    1883

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    1884
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    206 
    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    1886

     

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    1887

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    7

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    1889

    Đầu ra

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    2

    Độ phức tạp về thời gian. O(N)
    Không gian phụ. Ô(1)

    Mô hình thuật toán. Lập trình năng động

    Một cách suy nghĩ khác. (chỉ ở một bên vì đối với bên kia, nó sẽ giống nhau)

    Chúng ta hãy nghĩ về các tòa nhà như một chuỗi gồm N (vì có N ô ở hai bên) chuỗi nhị phân có độ dài (mỗi chữ số là 0 hoặc 1) trong đó

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    3

    Bây giờ, khi vấn đề nêu rõ, chúng ta phải tìm số cách sao cho chúng ta không có các Tòa nhà liên tiếp trên các ô, trong chuỗi nhị phân, nó có thể được hiểu là, chúng ta cần tìm số cách mà chúng ta không có

    Ví dụ

    Let countB(i) be count of possible ways with i sections
              ending with a building.
    countS(i) be count of possible ways with i sections
              ending with a space.

// A space can be added after a building or after a space.
countS(N) = countB(N-1) + countS(N-1)

// A building can only be added after a space.
countB[N] = countS(N-1)

// Result for one side is sum of the above two counts.
result1(N) = countS(N) + countB(N)

// Result for two sides is square of result1(N)
result2(N) = result1(N) * result1(N)
    2

    Vì vậy, bây giờ vấn đề của chúng ta được giảm xuống để tìm số cách biểu diễn chuỗi nhị phân có độ dài N sao cho nó không có số 1 liên tiếp, đây là một vấn đề khá chuẩn

    programming python

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