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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.

A196314 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 2,0,4,1,3 for x=0,1,2,3,4.

Table of values

n a(n)
1 1
2 3
3 3
4 4
5 5
6 4
7 5
8 8
9 8
10 5
11 8
12 17
13 7
14 17
15 8
16 12
17 34
18 50
19 50
20 34
21 12
22 17
23 62
24 111
25 335
26 111
27 62
28 17
29 25
30 123
31 259
32 866
33 866
34 259
35 123
36 25
37 37
38 243
39 728
40 2942
41 3349
42 2942
43 728
44 243
45 37
46 54
47 471
48 1800
49 13277
50 21545
51 21545
52 13277
53 1800
54 471
55 54
56 79
57 924
58 4696
59 56237

List of values

[1, 3, 3, 4, 5, 4, 5, 8, 8, 5, 8, 17, 7, 17, 8, 12, 34, 50, 50, 34, 12, 17, 62, 111, 335, 111, 62, 17, 25, 123, 259, 866, 866, 259, 123, 25, 37, 243, 728, 2942, 3349, 2942, 728, 243, 37, 54, 471, 1800, 13277, 21545, 21545, 13277, 1800, 471, 54, 79, 924, 4696, 56237]