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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.

A322750 Number of directed graphs of 2*n vertices each having an in-degree and out-degree of 1 such that the graph specifies a pairwise connected gift exchange with no reciprocal gifts.

Table of values

n a(n)
0 0
1 0
2 2
3 48
4 2640
5 250368
6 34110720
7 6347520000

List of values

[0, 0, 2, 48, 2640, 250368, 34110720, 6347520000]

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

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