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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.

A369140 Number of labeled loop-graphs covering {1..n} such that it is possible to choose a different vertex from each edge (choosable).

Table of values

n a(n)
0 1
1 1
2 4
3 23
4 193
5 2133
6 29410
7 486602
8 9395315
9 207341153
10 5147194204
11 141939786588
12 4304047703755
13 142317774817901
14 5095781837539766
15 196403997108015332
16 8106948166404074281
17 356781439557643998591
18 16675999433772328981216
19 824952192369049982670686

List of values

[1, 1, 4, 23, 193, 2133, 29410, 486602, 9395315, 207341153, 5147194204, 141939786588, 4304047703755, 142317774817901, 5095781837539766, 196403997108015332, 8106948166404074281, 356781439557643998591, 16675999433772328981216, 824952192369049982670686]

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

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