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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A203174 Number of n X n 0..2 arrays with every 1 immediately preceded by 0 to the left or above, no 0 immediately preceded by a 0, and every 2 immediately preceded by 0 1 to the left or above.

Table of values

n a(n)
1 1
2 1
3 7
4 59
5 952
6 32411
7 2208945
8 323885934
9 84492757788
10 47354744651060
11 53683376052551785
12 116641756206417848067
13 528882406558326590368278

List of values

[1, 1, 7, 59, 952, 32411, 2208945, 323885934, 84492757788, 47354744651060, 53683376052551785, 116641756206417848067, 528882406558326590368278]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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