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.

A258673 A total of n married couples, including a mathematician M and his wife, are to be seated at the 2n chairs around a circular table, with no man seated next to his wife. After the ladies are seated at every other chair, M is the first man allowed to choose one of the remaining chairs. The sequence gives the number of ways of seating the other men, with no man seated next to his wife, if M chooses the chair that is 11 seats clockwise from his wife's chair.

Table of values

n a(n)
1 0
2 0
3 0
4 0
5 0
6 0
7 115
8 791
9 6204
10 55004
11 543597
12 5922929
13 70518904
14 910711192
15 12678337943
16 189252400475
17 3015217932052
18 51067619064756
19 916176426421297
20 17355904144767765
21 346195850534324608
22 7252654441500343712
23 159210363453691696379
24 3654550890669607979359

List of values

[0, 0, 0, 0, 0, 0, 115, 791, 6204, 55004, 543597, 5922929, 70518904, 910711192, 12678337943, 189252400475, 3015217932052, 51067619064756, 916176426421297, 17355904144767765, 346195850534324608, 7252654441500343712, 159210363453691696379, 3654550890669607979359]

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

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