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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.

A262666 Irregular table read by rows: T(n,k) is the number of binary bisymmetric n X n matrices with exactly k 1's; n>=0, 0<=k<=n^2.

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 0
5 2
6 0
7 1
8 1
9 1
10 2
11 2
12 2
13 2
14 2
15 2
16 1
17 1
18 1
19 0
20 4
21 0
22 8
23 0
24 12
25 0
26 14
27 0
28 12
29 0
30 8
31 0
32 4
33 0
34 1
35 1
36 1
37 4
38 4
39 10
40 10
41 20
42 20
43 31
44 31
45 40
46 40
47 44
48 44
49 40
50 40
51 31
52 31
53 20
54 20
55 10
56 10
57 4
58 4
59 1
60 1
61 1
62 0
63 6
64 0
65 21
66 0
67 56
68 0
69 120
70 0
71 216
72 0
73 336
74 0
75 456
76 0

List of values

[1, 1, 1, 1, 0, 2, 0, 1, 1, 1, 2, 2, 2, 2, 2, 2, 1, 1, 1, 0, 4, 0, 8, 0, 12, 0, 14, 0, 12, 0, 8, 0, 4, 0, 1, 1, 1, 4, 4, 10, 10, 20, 20, 31, 31, 40, 40, 44, 44, 40, 40, 31, 31, 20, 20, 10, 10, 4, 4, 1, 1, 1, 0, 6, 0, 21, 0, 56, 0, 120, 0, 216, 0, 336, 0, 456, 0]

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