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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.

A369143 Number of labeled simple graphs with n edges and 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 30
6 1335
7 47460
8 1651230
9 59636640
10 2284113762
11 93498908580
12 4099070635935
13 192365988161490
14 9646654985111430
15 515736895712230192
16 29321225548502776980
17 1768139644819077541440
18 112805126206185257070660
19 7595507651522103787077270
20 538504704005397535690160274

List of values

[0, 0, 0, 0, 0, 30, 1335, 47460, 1651230, 59636640, 2284113762, 93498908580, 4099070635935, 192365988161490, 9646654985111430, 515736895712230192, 29321225548502776980, 1768139644819077541440, 112805126206185257070660, 7595507651522103787077270, 538504704005397535690160274]

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

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