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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.

A099699 Consider the family of directed multigraphs enriched by the species of involutions. Sequence gives number of those multigraphs with n labeled arcs.

Table of values

n a(n)
0 1
1 1
2 8
3 108
4 2200
5 61708
6 2249268
7 102377404
8 5651999688
9 370171228504
10 28262385542832
11 2480108374814480
12 247231765611893504
13 27722619251007202720
14 3467475213036160205984
15 480277499859342401636704
16 73202023124111697153718080
17 12209186681659842887207280448

List of values

[1, 1, 8, 108, 2200, 61708, 2249268, 102377404, 5651999688, 370171228504, 28262385542832, 2480108374814480, 247231765611893504, 27722619251007202720, 3467475213036160205984, 480277499859342401636704, 73202023124111697153718080, 12209186681659842887207280448]

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

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