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.

A273935 Number of ways to arrange n women and n men around a circular table so that they can be divided into n nonintersecting pairs of 1 woman and 1 man sitting side-by-side.

Table of values

n a(n)
0 1
1 1
2 6
3 84
4 2160
5 89280
6 5443200
7 460857600
8 51819264000
9 7476605337600
10 1347105779712000
11 296508121620480000
12 78297264318873600000
13 24431729220414996480000
14 8893692297263669575680000
15 3735464765667589501747200000
16 1793050447716486548029440000000

List of values

[1, 1, 6, 84, 2160, 89280, 5443200, 460857600, 51819264000, 7476605337600, 1347105779712000, 296508121620480000, 78297264318873600000, 24431729220414996480000, 8893692297263669575680000, 3735464765667589501747200000, 1793050447716486548029440000000]

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

Content is available under The OEIS End-User License Agreement.