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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.

A230068 T(n,k)=Number of nXk 0..2 arrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value 2-x(i,j).

Table of values

n a(n)
1 0
2 0
3 0
4 0
5 9
6 0
7 0
8 9
9 9
10 0
11 0
12 81
13 45
14 81
15 0
16 0
17 225
18 441
19 441
20 225
21 0
22 0
23 1089
24 3645
25 15129
26 3645
27 1089
28 0
29 0
30 3969
31 31329
32 281961
33 281961
34 31329
35 3969
36 0
37 0
38 16641
39 266805
40 6487209
41 14082255
42 6487209
43 266805
44 16641
45 0
46 0
47 65025
48 2277081
49 137945025

List of values

[0, 0, 0, 0, 9, 0, 0, 9, 9, 0, 0, 81, 45, 81, 0, 0, 225, 441, 441, 225, 0, 0, 1089, 3645, 15129, 3645, 1089, 0, 0, 3969, 31329, 281961, 281961, 31329, 3969, 0, 0, 16641, 266805, 6487209, 14082255, 6487209, 266805, 16641, 0, 0, 65025, 2277081, 137945025]