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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.

A203835 T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements.

Table of values

n a(n)
1 45
2 225
3 225
4 1125
5 1971
6 1125
7 5625
8 17289
9 17289
10 5625
11 28125
12 151659
13 270333
14 151659
15 28125
16 140625
17 1330353
18 4238721
19 4238721
20 1330353
21 140625
22 703125
23 11669859
24 66490965
25 119606211
26 66490965
27 11669859
28 703125
29 3515625
30 102368025

List of values

[45, 225, 225, 1125, 1971, 1125, 5625, 17289, 17289, 5625, 28125, 151659, 270333, 151659, 28125, 140625, 1330353, 4238721, 4238721, 1330353, 140625, 703125, 11669859, 66490965, 119606211, 66490965, 11669859, 703125, 3515625, 102368025]

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

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