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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.

A253293 Number of (n+1)X(5+1) 0..2 arrays with every 2X2 subblock sum differing from its neighbors horizontally, vertically, diagonally and antidiagonally.

Table of values

n a(n)
1 186624
2 1184928
3 7431136
4 61286116
5 486417836
6 4028778100
7 32585471254
8 268974784168
9 2194325404780
10 18267942030516
11 149525306842164
12 1236309598259424
13 10153736125504116
14 84093032702185292
15 691354236502296106

List of values

[186624, 1184928, 7431136, 61286116, 486417836, 4028778100, 32585471254, 268974784168, 2194325404780, 18267942030516, 149525306842164, 1236309598259424, 10153736125504116, 84093032702185292, 691354236502296106]

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

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