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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.

A369141 Number of labeled loop-graphs covering a subset of {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 25
4 710
5 29394
6 2051522
7 267690539
8 68705230758
9 35184059906570
10 36028789310419722
11 73786976083150073999
12 302231454897259573627852
13 2475880078570549574773324062
14 40564819207303333310731978895956
15 1329227995784915872613854321228773937

List of values

[0, 0, 1, 25, 710, 29394, 2051522, 267690539, 68705230758, 35184059906570, 36028789310419722, 73786976083150073999, 302231454897259573627852, 2475880078570549574773324062, 40564819207303333310731978895956, 1329227995784915872613854321228773937]

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

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