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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.

A196207 Number of nX5 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,0,3,4,1 for x=0,1,2,3,4.

Table of values

n a(n)
1 8
2 18
3 17
4 70
5 135
6 301
7 751
8 1774
9 4243
10 10211
11 24823
12 60093
13 145378
14 351699
15 855562
16 2076868
17 5030512
18 12211093
19 29679181
20 72051591
21 174807032
22 424556639
23 1031502532
24 2504434609
25 6080193626
26 14768788766
27 35874049343
28 87112767731

List of values

[8, 18, 17, 70, 135, 301, 751, 1774, 4243, 10211, 24823, 60093, 145378, 351699, 855562, 2076868, 5030512, 12211093, 29679181, 72051591, 174807032, 424556639, 1031502532, 2504434609, 6080193626, 14768788766, 35874049343, 87112767731]

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

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