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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.

A196685 T(n,k)=Number of nXk 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,0,1,2,3 for x=0,1,2,3,4.

Table of values

n a(n)
1 1
2 3
3 3
4 4
5 9
6 4
7 5
8 20
9 20
10 5
11 9
12 61
13 58
14 61
15 9
16 16
17 189
18 292
19 292
20 189
21 16
22 25
23 544
24 1235
25 2245
26 1235
27 544
28 25
29 39
30 1629
31 5186
32 15395
33 15395
34 5186
35 1629
36 39
37 64
38 4973
39 22461
40 109528
41 188078
42 109528
43 22461
44 4973
45 64
46 105
47 15040
48 96256
49 796557
50 2169685

List of values

[1, 3, 3, 4, 9, 4, 5, 20, 20, 5, 9, 61, 58, 61, 9, 16, 189, 292, 292, 189, 16, 25, 544, 1235, 2245, 1235, 544, 25, 39, 1629, 5186, 15395, 15395, 5186, 1629, 39, 64, 4973, 22461, 109528, 188078, 109528, 22461, 4973, 64, 105, 15040, 96256, 796557, 2169685]