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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.

A102580 Number of n-node labeled connected digraphs whose underlying graphs are mating graphs, cf. A006024.

Table of values

n a(n)
0 1
1 1
2 3
3 27
4 2025
5 566190
6 625831920
7 2774192113350
8 49208948146347570
9 3472093007861482740960
10 971461407155771477392032600
11 1076446082528185671934674675023160
12 4723701978908086606944984284949329285400
13 82155133922723780601138029235949809990647219040

List of values

[1, 1, 3, 27, 2025, 566190, 625831920, 2774192113350, 49208948146347570, 3472093007861482740960, 971461407155771477392032600, 1076446082528185671934674675023160, 4723701978908086606944984284949329285400, 82155133922723780601138029235949809990647219040]

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

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