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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.

A099692 Consider the family of multigraphs enriched by the species of directed sets. Sequence gives number of those multigraphs with n labeled edges.

Table of values

n a(n)
0 1
1 1
2 4
3 23
4 220
5 3016
6 55011
7 1265824
8 35496711
9 1183686987
10 46072834777
11 2062557088117
12 104926356851165
13 6004962409831577
14 383331023991407286
15 27094756978689827593
16 2107021273883402908850
17 179261681391054814324774
18 16602830645109035036038335

List of values

[1, 1, 4, 23, 220, 3016, 55011, 1265824, 35496711, 1183686987, 46072834777, 2062557088117, 104926356851165, 6004962409831577, 383331023991407286, 27094756978689827593, 2107021273883402908850, 179261681391054814324774, 16602830645109035036038335]

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

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