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.

A029759 Number of permutations which are the union of an increasing and a decreasing subsequence.

Table of values

n a(n)
0 1
1 1
2 2
3 6
4 22
5 86
6 340
7 1340
8 5254
9 20518
10 79932
11 311028
12 1209916
13 4707964
14 18330728
15 71429176
16 278586182
17 1087537414
18 4249391468
19 16618640836
20 65048019092
21 254814326164
22 998953992728
23 3919041821896
24 15385395144092
25 60438585676636

List of values

[1, 1, 2, 6, 22, 86, 340, 1340, 5254, 20518, 79932, 311028, 1209916, 4707964, 18330728, 71429176, 278586182, 1087537414, 4249391468, 16618640836, 65048019092, 254814326164, 998953992728, 3919041821896, 15385395144092, 60438585676636]

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

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