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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.

A367537 a(n) is the number of ways to make a Secret Santa assignment among n couples such that no one gets their partner's name and if A gets B's name, B does not get A's name.

Table of values

n a(n)
1 0
2 2
3 48
4 2652
5 251328
6 34213080
7 6362490816

List of values

[0, 2, 48, 2652, 251328, 34213080, 6362490816]

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

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