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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.

A098626 Consider the family of directed multigraphs enriched by the species of derangements. Sequence gives number of those multigraphs with n labeled loops and arcs.

Table of values

n a(n)
0 1
1 0
2 2
3 4
4 57
5 348
6 5235
7 57930
8 1037540
9 16842496
10 363889755
11 7792175070
12 201054289293
13 5345844537876
14 162234861271288
15 5156725529935952
16 181284205622239755
17 6713109719185427600
18 269652617328843102055
19 11418447984579685481310
20 517839485352765454438270

List of values

[1, 0, 2, 4, 57, 348, 5235, 57930, 1037540, 16842496, 363889755, 7792175070, 201054289293, 5345844537876, 162234861271288, 5156725529935952, 181284205622239755, 6713109719185427600, 269652617328843102055, 11418447984579685481310, 517839485352765454438270]

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

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