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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.

A269097 T(n,k)=Number of nXk 0..3 arrays with some element plus some horizontally or vertically adjacent neighbor totalling three exactly once.

Table of values

n a(n)
1 0
2 4
3 4
4 24
5 96
6 24
7 108
8 1152
9 1152
10 108
11 432
12 11424
13 31296
14 11424
15 432
16 1620
17 103488
18 715320
19 715320
20 103488
21 1620
22 5832
23 889056
24 15024096
25 37963968
26 15024096
27 889056
28 5832
29 20412
30 7375872
31 300056400
32 1856325000
33 1856325000
34 300056400
35 7375872

List of values

[0, 4, 4, 24, 96, 24, 108, 1152, 1152, 108, 432, 11424, 31296, 11424, 432, 1620, 103488, 715320, 715320, 103488, 1620, 5832, 889056, 15024096, 37963968, 15024096, 889056, 5832, 20412, 7375872, 300056400, 1856325000, 1856325000, 300056400, 7375872]

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

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