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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.

A195974 Number of n X 4 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,0,1,3,4 for x=0,1,2,3,4.

Table of values

n a(n)
1 5
2 23
3 36
4 67
5 133
6 256
7 455
8 931
9 1830
10 3565
11 7001
12 13872
13 27433
14 54401
15 108164
16 215285
17 428869
18 855426
19 1707759
20 3411577
21 6819860
22 13640635
23 27294311
24 54635604
25 109402661
26 219127235
27 438997334
28 879659285
29 1762952379
30 3533677212

List of values

[5, 23, 36, 67, 133, 256, 455, 931, 1830, 3565, 7001, 13872, 27433, 54401, 108164, 215285, 428869, 855426, 1707759, 3411577, 6819860, 13640635, 27294311, 54635604, 109402661, 219127235, 438997334, 879659285, 1762952379, 3533677212]

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

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