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.

A001266 One-half the number of permutations of length n without rising or falling successions.

Table of values

n a(n)
2 0
3 0
4 1
5 7
6 45
7 323
8 2621
9 23811
10 239653
11 2648395
12 31889517
13 415641779
14 5830753109
15 87601592187
16 1403439027805
17 23883728565283
18 430284458893701
19 8181419271349931
20 163730286973255373
21 3440164703027845395
22 75718273707281368117
23 1742211593431076483419

List of values

[0, 0, 1, 7, 45, 323, 2621, 23811, 239653, 2648395, 31889517, 415641779, 5830753109, 87601592187, 1403439027805, 23883728565283, 430284458893701, 8181419271349931, 163730286973255373, 3440164703027845395, 75718273707281368117, 1742211593431076483419]

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

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