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.

A302897 Number of permutations of [n] having exactly four alternating descents.

Table of values

n a(n)
5 16
6 117
7 1056
8 8699
9 76840
10 704834
11 6847224
12 70145634
13 758805360
14 8650769675
15 103790273632
16 1308042935717
17 17285090008280
18 239069573622720
19 3454877140757160
20 52081336911782580
21 817705146857293920
22 13351745346381390705
23 226414777897783513040

List of values

[16, 117, 1056, 8699, 76840, 704834, 6847224, 70145634, 758805360, 8650769675, 103790273632, 1308042935717, 17285090008280, 239069573622720, 3454877140757160, 52081336911782580, 817705146857293920, 13351745346381390705, 226414777897783513040]

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

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