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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.

A369146 Number of unlabeled loop-graphs with up to 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 1
3 8
4 60
5 471
6 4911
7 78797
8 2207405
9 113740613
10 10926218807
11 1956363413115
12 652335084532025
13 405402273420833338
14 470568642161119515627
15 1023063423471189429817807
16 4178849203082023236054797465
17 32168008290073542372004072630072
18 468053896898117580623237189882068990

List of values

[0, 0, 1, 8, 60, 471, 4911, 78797, 2207405, 113740613, 10926218807, 1956363413115, 652335084532025, 405402273420833338, 470568642161119515627, 1023063423471189429817807, 4178849203082023236054797465, 32168008290073542372004072630072, 468053896898117580623237189882068990]

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

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