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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.

A137802 Number of arrangements of 2n couples into n cars such that each car contains 2 men and 2 women but no couple (cars are unlabeled).

Table of values

n a(n)
1 0
2 3
3 150
4 31185
5 12999420
6 9622703475
7 11539805487210
8 20981809690466625
9 54997428661808232600
10 199760599884519009411075
11 973866344327734952575230750
12 6207575427404936259602204502225

List of values

[0, 3, 150, 31185, 12999420, 9622703475, 11539805487210, 20981809690466625, 54997428661808232600, 199760599884519009411075, 973866344327734952575230750, 6207575427404936259602204502225]

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

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