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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.

A322140 Number of labeled 2-connected multigraphs with n edges (the vertices are {1,2,...,k} for some k).

Table of values

n a(n)
0 1
1 1
2 1
3 2
4 7
5 37
6 262
7 2312
8 24338
9 296928
10 4112957
11 63692909
12 1089526922
13 20389411551
14 414146189901
15 9070116944468
16 212983762029683
17 5336570227705763
18 142083405456873290
19 4004953714929148655
20 119128974685786590410
21 3728639072095285867881

List of values

[1, 1, 1, 2, 7, 37, 262, 2312, 24338, 296928, 4112957, 63692909, 1089526922, 20389411551, 414146189901, 9070116944468, 212983762029683, 5336570227705763, 142083405456873290, 4004953714929148655, 119128974685786590410, 3728639072095285867881]

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

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