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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.

A195975 Number of nX5 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 9
2 43
3 67
4 133
5 244
6 519
7 1072
8 2225
9 4456
10 9098
11 19066
12 39689
13 82372
14 171498
15 358146
16 748911
17 1567225
18 3279792
19 6866722
20 14390098
21 30170057
22 63261378
23 132676528
24 278340227
25 584041659
26 1225661652
27 2572438981
28 5399619168
29 11334969352

List of values

[9, 43, 67, 133, 244, 519, 1072, 2225, 4456, 9098, 19066, 39689, 82372, 171498, 358146, 748911, 1567225, 3279792, 6866722, 14390098, 30170057, 63261378, 132676528, 278340227, 584041659, 1225661652, 2572438981, 5399619168, 11334969352]

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

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