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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.

A369142 Number of labeled loop-graphs covering {1..n} such that it is not possible to choose a different vertex from each edge (non-choosable).

Table of values

n a(n)
0 0
1 0
2 1
3 22
4 616
5 26084
6 1885323
7 253923163
8 66619551326
9 34575180977552
10 35680008747431929
11 73392583275070667841
12 301348381377662031986734
13 2471956814761854578316988092
14 40530184362443276558060719358471
15 1328619783326799871747200601484790193

List of values

[0, 0, 1, 22, 616, 26084, 1885323, 253923163, 66619551326, 34575180977552, 35680008747431929, 73392583275070667841, 301348381377662031986734, 2471956814761854578316988092, 40530184362443276558060719358471, 1328619783326799871747200601484790193]

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

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