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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.

A137801 Number of arrangements of 2n couples into n cars such that each car contains 2 men and 2 women but no couple (cars are labeled).

Table of values

n a(n)
1 0
2 6
3 900
4 748440
5 1559930400
6 6928346502000
7 58160619655538400
8 845986566719614320000
9 19957466912796971445888000
10 724891264860942581350908960000
11 38873628093261330554954970801600000

List of values

[0, 6, 900, 748440, 1559930400, 6928346502000, 58160619655538400, 845986566719614320000, 19957466912796971445888000, 724891264860942581350908960000, 38873628093261330554954970801600000]

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

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