cp's OEIS Frontend

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.

A114939 Number of essentially different seating arrangements for n couples around a circular table with 2n seats avoiding spouses being neighbors and avoiding clusters of 3 persons with equal gender.

Table of values

n a(n)
1 0
2 1
3 7
4 216
5 10956
6 803400
7 83003040
8 11579823360
9 2080493573760
10 469031859192960
11 129727461014726400
12 43176116371928601600
13 17025803126147196057600
14 7850538273249476117913600

List of values

[0, 1, 7, 216, 10956, 803400, 83003040, 11579823360, 2080493573760, 469031859192960, 129727461014726400, 43176116371928601600, 17025803126147196057600, 7850538273249476117913600]

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

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