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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.

A196300 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 3,0,1,4,2 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
17 187
18 290
19 290
20 187
21 16
22 25
23 536
24 1201
25 2161
26 1201
27 536
28 25
29 39
30 1597
31 4988
32 14231
33 14231
34 4988
35 1597
36 39
37 64
38 4849
39 21344
40 97892
41 160800
42 97892
43 21344
44 4849
45 64
46 105
47 14582
48 90150
49 686759
50 1752855
51 1752855

List of values

[1, 3, 3, 4, 9, 4, 5, 20, 20, 5, 9, 61, 58, 61, 9, 16, 187, 290, 290, 187, 16, 25, 536, 1201, 2161, 1201, 536, 25, 39, 1597, 4988, 14231, 14231, 4988, 1597, 39, 64, 4849, 21344, 97892, 160800, 97892, 21344, 4849, 64, 105, 14582, 90150, 686759, 1752855, 1752855]