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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.

A263626 Number of inequivalent self-complementary Seidel matrices of order n.

Table of values

n a(n)
1 1
2 1
3 0
4 1
5 1
6 4
7 0
8 19
9 10
10 360
11 0
12 25112
13 720
14 6975976
15 0
16 7030565576
17 703760
18 25473667704064
19 0
20 333377175390634880
21 9168331776
22 15881995583375102901824
23 0
24 2775171714758797872451279104
25 1601371799340544
26 1790676527377592615808645709379328
27 0
28 4291738728096066980970104665682237420544
29 3837878966366932639744
30 38401679870039848205115101680007123726281532416
31 0

List of values

[1, 1, 0, 1, 1, 4, 0, 19, 10, 360, 0, 25112, 720, 6975976, 0, 7030565576, 703760, 25473667704064, 0, 333377175390634880, 9168331776, 15881995583375102901824, 0, 2775171714758797872451279104, 1601371799340544, 1790676527377592615808645709379328, 0, 4291738728096066980970104665682237420544, 3837878966366932639744, 38401679870039848205115101680007123726281532416, 0]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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