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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.

A196012 Number of n X 3 0..4 arrays with each element equal to the number its horizontal and vertical neighbors within one of itself.

Table of values

n a(n)
1 1
2 1
3 2
4 7
5 13
6 16
7 32
8 65
9 125
10 211
11 390
12 732
13 1368
14 2478
15 4555
16 8417
17 15564
18 28583
19 52598
20 96921
21 178684
22 328956
23 605723
24 1115678
25 2055336
26 3785356
27 6971537
28 12840292
29 23650713
30 43560381
31 80229677
32 147768685
33 272167135
34 501285666

List of values

[1, 1, 2, 7, 13, 16, 32, 65, 125, 211, 390, 732, 1368, 2478, 4555, 8417, 15564, 28583, 52598, 96921, 178684, 328956, 605723, 1115678, 2055336, 3785356, 6971537, 12840292, 23650713, 43560381, 80229677, 147768685, 272167135, 501285666]

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

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