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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.

A197886 Number of nX5 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 0,2,1,1,1 for x=0,1,2,3,4.

Table of values

n a(n)
1 1
2 18
3 77
4 835
5 2730
6 17890
7 92843
8 567991
9 3000116
10 17111462
11 94740977
12 537643352
13 2995145891
14 16728999681
15 93489922434
16 524952952537
17 2940191924830
18 16425787144594
19 91861015115420
20 514650900540840
21 2882700958009902

List of values

[1, 18, 77, 835, 2730, 17890, 92843, 567991, 3000116, 17111462, 94740977, 537643352, 2995145891, 16728999681, 93489922434, 524952952537, 2940191924830, 16425787144594, 91861015115420, 514650900540840, 2882700958009902]

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

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