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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.

A196681 Number of n X 4 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,0,1,2,3 for x=0,1,2,3,4.

Table of values

n a(n)
1 5
2 61
3 292
4 2245
5 15395
6 109528
7 796557
8 5702355
9 40479328
10 289195575
11 2074543871
12 14876511544
13 106491873717
14 761738952927
15 5453371319038
16 39065425553179
17 279802106777205
18 2003379491308618
19 14343725864416775
20 102713433223681069

List of values

[5, 61, 292, 2245, 15395, 109528, 796557, 5702355, 40479328, 289195575, 2074543871, 14876511544, 106491873717, 761738952927, 5453371319038, 39065425553179, 279802106777205, 2003379491308618, 14343725864416775, 102713433223681069]

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

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