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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.

A196680 Number of nX3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,0,1,2,3 for x=0,1,2,3,4.

Table of values

n a(n)
1 4
2 20
3 58
4 292
5 1235
6 5186
7 22461
8 96256
9 413032
10 1780597
11 7673860
12 33017186
13 142219489
14 612618957
15 2638803566
16 11367909928
17 48973948677
18 210982341958
19 908945163931
20 3915948771137
21 16870934284560
22 72684969189462

List of values

[4, 20, 58, 292, 1235, 5186, 22461, 96256, 413032, 1780597, 7673860, 33017186, 142219489, 612618957, 2638803566, 11367909928, 48973948677, 210982341958, 908945163931, 3915948771137, 16870934284560, 72684969189462]

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

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