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.

A097597 Number of permutations of [n] with no increasing runs of even length.

Table of values

n a(n)
0 1
1 1
2 1
3 2
4 7
5 25
6 102
7 531
8 3141
9 20218
10 146215
11 1174889
12 10225678
13 96226363
14 978420285
15 10657592850
16 123672458583
17 1525420453945
18 19929519469558
19 274771355003651
20 3987385414116085
21 60764250319690666
22 970085750385722631
23 16190361659675002857

List of values

[1, 1, 1, 2, 7, 25, 102, 531, 3141, 20218, 146215, 1174889, 10225678, 96226363, 978420285, 10657592850, 123672458583, 1525420453945, 19929519469558, 274771355003651, 3987385414116085, 60764250319690666, 970085750385722631, 16190361659675002857]

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

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