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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.

A368927 Number of labeled loop-graphs covering a subset of {1..n} such that it is possible to choose a different vertex from each edge.

Table of values

n a(n)
0 1
1 2
2 7
3 39
4 314
5 3374
6 45630
7 744917
8 14245978
9 312182262
10 7708544246
11 211688132465
12 6397720048692
13 210975024924386
14 7537162523676076
15 289952739051570639
16 11949100971787370300
17 525142845422124145682
18 24515591201199758681892
19 1211486045654016217202663

List of values

[1, 2, 7, 39, 314, 3374, 45630, 744917, 14245978, 312182262, 7708544246, 211688132465, 6397720048692, 210975024924386, 7537162523676076, 289952739051570639, 11949100971787370300, 525142845422124145682, 24515591201199758681892, 1211486045654016217202663]

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

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