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.

A000352 One half of the number of permutations of [n] such that the differences have three runs with the same signs.

Table of values

n a(n)
4 5
5 29
6 118
7 418
8 1383
9 4407
10 13736
11 42236
12 128761
13 390385
14 1179354
15 3554454
16 10696139
17 32153963
18 96592972
19 290041072
20 870647517
21 2612991141
22 7841070590
23 23527406090
24 70590606895
25 211788597919
26 635399348208
27 1906265153508
28 5718929678273
29 17157057470297

List of values

[5, 29, 118, 418, 1383, 4407, 13736, 42236, 128761, 390385, 1179354, 3554454, 10696139, 32153963, 96592972, 290041072, 870647517, 2612991141, 7841070590, 23527406090, 70590606895, 211788597919, 635399348208, 1906265153508, 5718929678273, 17157057470297]

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

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