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.

A002854 Number of unlabeled Euler graphs with n nodes; number of unlabeled two-graphs with n nodes; number of unlabeled switching classes of graphs with n nodes; number of switching classes of unlabeled signed complete graphs on n nodes; number of Seidel matrices of order n.

Table of values

n a(n)
1 1
2 1
3 2
4 3
5 7
6 16
7 54
8 243
9 2038
10 33120
11 1182004
12 87723296
13 12886193064
14 3633057074584
15 1944000150734320
16 1967881448329407496
17 3768516017219786199856
18 13670271807937483065795200
19 94109042015724412679233018144
20 1232069666043220685614640133362240

List of values

[1, 1, 2, 3, 7, 16, 54, 243, 2038, 33120, 1182004, 87723296, 12886193064, 3633057074584, 1944000150734320, 1967881448329407496, 3768516017219786199856, 13670271807937483065795200, 94109042015724412679233018144, 1232069666043220685614640133362240]

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

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