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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.

A268971 T(n,k)=Number of nXk 0..2 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two not more than once.

Table of values

n a(n)
1 3
2 9
3 9
4 24
5 60
6 27
7 60
8 240
9 336
10 81
11 144
12 912
13 2016
14 1728
15 243
16 336
17 3312
18 11664
19 15552
20 8448
21 729
22 768
23 11664
24 63792
25 136080
26 114048
27 39936
28 2187
29 1728
30 40176
31 339480
32 1125360
33 1504656
34 808704
35 184320
36 6561
37 3840
38 136080
39 1770048
40 9093528
41 18852912

List of values

[3, 9, 9, 24, 60, 27, 60, 240, 336, 81, 144, 912, 2016, 1728, 243, 336, 3312, 11664, 15552, 8448, 729, 768, 11664, 63792, 136080, 114048, 39936, 2187, 1728, 40176, 339480, 1125360, 1504656, 808704, 184320, 6561, 3840, 136080, 1770048, 9093528, 18852912]

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

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