cp's OEIS Frontend

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.

A000986 Number of n X n symmetric matrices with (0,1) entries and all row sums 2.

Table of values

n a(n)
0 1
1 0
2 1
3 4
4 18
5 112
6 820
7 6912
8 66178
9 708256
10 8372754
11 108306280
12 1521077404
13 23041655136
14 374385141832
15 6493515450688
16 119724090206940
17 2337913445039488
18 48195668439235612
19 1045828865817825264
20 23826258064972682776
21 568556266922455167040

List of values

[1, 0, 1, 4, 18, 112, 820, 6912, 66178, 708256, 8372754, 108306280, 1521077404, 23041655136, 374385141832, 6493515450688, 119724090206940, 2337913445039488, 48195668439235612, 1045828865817825264, 23826258064972682776, 568556266922455167040]

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

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