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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.

A196474 Number of nX5 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,0,3,2,1 for x=0,1,2,3,4.

Table of values

n a(n)
1 8
2 18
3 17
4 70
5 151
6 557
7 2351
8 6926
9 16083
10 43523
11 126887
12 366749
13 1196290
14 3904083
15 12242778
16 35866180
17 101052064
18 296050389
19 899499517
20 2807496039
21 8933240984
22 27433666911
23 81672960692
24 242780272113
25 727008678986
26 2224880992862

List of values

[8, 18, 17, 70, 151, 557, 2351, 6926, 16083, 43523, 126887, 366749, 1196290, 3904083, 12242778, 35866180, 101052064, 296050389, 899499517, 2807496039, 8933240984, 27433666911, 81672960692, 242780272113, 727008678986, 2224880992862]

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

Content is available under The OEIS End-User License Agreement.