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.

A186365 Number of fixed points in all cycle-up-down permutations of {1,2,...,n}.

Table of values

n a(n)
0 0
1 1
2 2
3 6
4 20
5 80
6 366
7 1904
8 11080
9 71424
10 505210
11 3891712
12 32433180
13 290787328
14 2791053734
15 28556359680
16 310264194320
17 3567710830592
18 43287834157938
19 552688817143808
20 7407423764750500
21 103981459115606016
22 1525675236649033822
23 23354749389657604096

List of values

[0, 1, 2, 6, 20, 80, 366, 1904, 11080, 71424, 505210, 3891712, 32433180, 290787328, 2791053734, 28556359680, 310264194320, 3567710830592, 43287834157938, 552688817143808, 7407423764750500, 103981459115606016, 1525675236649033822, 23354749389657604096]

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

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