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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.

A253164 T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with every 2X2 subblock sum differing from its neighbors horizontally, vertically and nw-se diagonally.

Table of values

n a(n)
1 81
2 558
3 558
4 3844
5 5136
6 3844
7 26784
8 46752
9 46752
10 26784
11 186624
12 443362
13 555842
14 443362
15 186624
16 1296000
17 4189216
18 7252320
19 7252320
20 4189216
21 1296000
22 9000000
23 39478862
24 92998506
25 135741428
26 92998506
27 39478862
28 9000000
29 62568000

List of values

[81, 558, 558, 3844, 5136, 3844, 26784, 46752, 46752, 26784, 186624, 443362, 555842, 443362, 186624, 1296000, 4189216, 7252320, 7252320, 4189216, 1296000, 9000000, 39478862, 92998506, 135741428, 92998506, 39478862, 9000000, 62568000]

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

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