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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.

A262742 Irregular table read by rows: T(n,k) is the number of binary symmetric n X n matrices with exactly k 1's; n>=0, 0<=k<=n^2. Where the symmetry axes are in horizontal and vertical.

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 0
5 0
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 0
21 0
22 4
23 0
24 0
25 0
26 6
27 0
28 0
29 0
30 4
31 0
32 0
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 0
64 0
65 9
66 0
67 0
68 0
69 36
70 0
71 0
72 0
73 84
74 0
75 0
76 0
77 126
78 0
79 0

List of values

[1, 1, 1, 1, 0, 0, 0, 1, 1, 1, 2, 2, 2, 2, 2, 2, 1, 1, 1, 0, 0, 0, 4, 0, 0, 0, 6, 0, 0, 0, 4, 0, 0, 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, 0, 0, 9, 0, 0, 0, 36, 0, 0, 0, 84, 0, 0, 0, 126, 0, 0]

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