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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.

A229380 T(n,k)=Number of nXk 0..2 arrays avoiding 11 horizontally, 22 vertically and 00 diagonally or antidiagonally.

Table of values

n a(n)
1 3
2 8
3 8
4 22
5 30
6 22
7 60
8 126
9 126
10 60
11 164
12 518
13 956
14 518
15 164
16 448
17 2138
18 6730
19 6730
20 2138
21 448
22 1224
23 8818
24 48490
25 78690
26 48490
27 8818
28 1224
29 3344
30 36374
31 346598
32 956866
33 956866
34 346598
35 36374
36 3344
37 9136
38 150038
39 2486980
40 11441370
41 20014278
42 11441370

List of values

[3, 8, 8, 22, 30, 22, 60, 126, 126, 60, 164, 518, 956, 518, 164, 448, 2138, 6730, 6730, 2138, 448, 1224, 8818, 48490, 78690, 48490, 8818, 1224, 3344, 36374, 346598, 956866, 956866, 346598, 36374, 3344, 9136, 150038, 2486980, 11441370, 20014278, 11441370]

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

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