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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.

A232955 T(n,k)=Number of nXk 0..3 arrays with no element x(i,j) adjacent to value 3-x(i,j) horizontally, diagonally or antidiagonally, and top left element zero.

Table of values

n a(n)
1 1
2 3
3 4
4 9
5 21
6 16
7 27
8 129
9 147
10 64
11 81
12 771
13 1881
14 1029
15 256
16 243
17 4629
18 22971
19 27441
20 7203
21 1024
22 729
23 27771
24 283131
25 685251
26 400329
27 50421
28 4096
29 2187
30 166629
31 3484893
32 17429409
33 20442651
34 5840289
35 352947
36 16384
37 6561
38 999771
39 42904365
40 442227825

List of values

[1, 3, 4, 9, 21, 16, 27, 129, 147, 64, 81, 771, 1881, 1029, 256, 243, 4629, 22971, 27441, 7203, 1024, 729, 27771, 283131, 685251, 400329, 50421, 4096, 2187, 166629, 3484893, 17429409, 20442651, 5840289, 352947, 16384, 6561, 999771, 42904365, 442227825]

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

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