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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.

A369144 Number of labeled simple graphs with n edges covering n vertices 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 0
3 0
4 0
5 0
6 90
7 4935
8 200970
9 7636860
10 291089610
11 11459170800
12 471932476290
13 20447369179380
14 933942958593645
15 44981469288560805
16 2282792616992648670
17 121924195590795244920
18 6843305987751060036720
19 403003907531795513467260
20 24861219342100679072572470

List of values

[0, 0, 0, 0, 0, 0, 90, 4935, 200970, 7636860, 291089610, 11459170800, 471932476290, 20447369179380, 933942958593645, 44981469288560805, 2282792616992648670, 121924195590795244920, 6843305987751060036720, 403003907531795513467260, 24861219342100679072572470]

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

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