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.

A089222 Number of ways of seating n people around a table for the second time without anyone sitting next to the same person as they did the first time.

Table of values

n a(n)
0 1
1 0
2 0
3 0
4 0
5 10
6 36
7 322
8 2832
9 27954
10 299260
11 3474482
12 43546872
13 586722162
14 8463487844
15 130214368530
16 2129319003680
17 36889393903794
18 675098760648204
19 13015877566642418
20 263726707757115400
21 5603148830577775218
22 124568968969991162100
23 2892414672938546871250

List of values

[1, 0, 0, 0, 0, 10, 36, 322, 2832, 27954, 299260, 3474482, 43546872, 586722162, 8463487844, 130214368530, 2129319003680, 36889393903794, 675098760648204, 13015877566642418, 263726707757115400, 5603148830577775218, 124568968969991162100, 2892414672938546871250]

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

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