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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.

A099698 Consider the family of directed multigraphs enriched by the species of involutions. Sequence gives number of those multigraphs with n labeled loops and arcs.

Table of values

n a(n)
0 1
1 2
2 17
3 248
4 5403
5 160420
6 6142567
7 291996934
8 16759322733
9 1136940595762
10 89641455771637
11 8102778995663368
12 830222723124364047
13 95509354134959796556
14 12236166882713532940611
15 1733521075683722202738222
16 269910543278748394820341769
17 45936441912756036235229989058

List of values

[1, 2, 17, 248, 5403, 160420, 6142567, 291996934, 16759322733, 1136940595762, 89641455771637, 8102778995663368, 830222723124364047, 95509354134959796556, 12236166882713532940611, 1733521075683722202738222, 269910543278748394820341769, 45936441912756036235229989058]

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

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