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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.

A197250 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 0,0,1,1,1 for x=0,1,2,3,4.

Table of values

n a(n)
1 1
2 2
3 2
4 1
5 4
6 1
7 1
8 8
9 8
10 1
11 3
12 16
13 3
14 16
15 3
16 3
17 40
18 53
19 53
20 40
21 3
22 2
23 80
24 110
25 275
26 110
27 80
28 2
29 4
30 192
31 227
32 780
33 780
34 227
35 192
36 4
37 6
38 400
39 1035
40 5713
41 5062
42 5713
43 1035
44 400
45 6
46 5
47 936
48 2004
49 16773
50 31276
51 31276
52 16773
53 2004
54 936
55 5
56 6
57 1984
58 7529
59 98870
60 213912
61 405065

List of values

[1, 2, 2, 1, 4, 1, 1, 8, 8, 1, 3, 16, 3, 16, 3, 3, 40, 53, 53, 40, 3, 2, 80, 110, 275, 110, 80, 2, 4, 192, 227, 780, 780, 227, 192, 4, 6, 400, 1035, 5713, 5062, 5713, 1035, 400, 6, 5, 936, 2004, 16773, 31276, 31276, 16773, 2004, 936, 5, 6, 1984, 7529, 98870, 213912, 405065]