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.

A227883 Number of permutations of [n] with exactly one occurrence of the consecutive step pattern up, down, up.

Table of values

n a(n)
0 0
1 0
2 0
3 0
4 5
5 50
6 328
7 2154
8 16751
9 144840
10 1314149
11 12735722
12 134159743
13 1519210786
14 18272249418
15 233231701166
16 3159471128588
17 45243728569842
18 682183513506619
19 10807962134238068
20 179606706777512992
21 3123700853586733882
22 56737351453843424893

List of values

[0, 0, 0, 0, 5, 50, 328, 2154, 16751, 144840, 1314149, 12735722, 134159743, 1519210786, 18272249418, 233231701166, 3159471128588, 45243728569842, 682183513506619, 10807962134238068, 179606706777512992, 3123700853586733882, 56737351453843424893]

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

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