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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.

A269289 T(n,k)=Number of nXk 0..3 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling three no more than once.

Table of values

n a(n)
1 4
2 16
3 16
4 60
5 216
6 64
7 216
8 2124
9 2592
10 256
11 756
12 19188
13 62748
14 29160
15 1024
16 2592
17 164556
18 1363572
19 1698732
20 314928
21 4096
22 8748
23 1363572
24 27788292
25 87559668
26 43674876
27 3306744
28 16384
29 29160
30 11026764
31 544118148
32 4204943820
33 5306911092

List of values

[4, 16, 16, 60, 216, 64, 216, 2124, 2592, 256, 756, 19188, 62748, 29160, 1024, 2592, 164556, 1363572, 1698732, 314928, 4096, 8748, 1363572, 27788292, 87559668, 43674876, 3306744, 16384, 29160, 11026764, 544118148, 4204943820, 5306911092]

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

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