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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.

A099696 Consider the family of multigraphs enriched by the species of involutions. Sequence gives number of those multigraphs with n labeled edges.

Table of values

n a(n)
0 1
1 1
2 4
3 25
4 244
5 3380
6 62133
7 1440382
8 40673705
9 1364815169
10 53415511305
11 2402797049419
12 122751622204827
13 7051227704802797
14 451598420376965588
15 32013004761567761223
16 2495936511077175475140
17 212840593118800653411004
18 19753575434503894710824531

List of values

[1, 1, 4, 25, 244, 3380, 62133, 1440382, 40673705, 1364815169, 53415511305, 2402797049419, 122751622204827, 7051227704802797, 451598420376965588, 32013004761567761223, 2495936511077175475140, 212840593118800653411004, 19753575434503894710824531]

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

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