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.

A256881 a(n) = n!/ceiling(n/2).

Table of values

n a(n)
1 1
2 2
3 3
4 12
5 40
6 240
7 1260
8 10080
9 72576
10 725760
11 6652800
12 79833600
13 889574400
14 12454041600
15 163459296000
16 2615348736000
17 39520825344000
18 711374856192000
19 12164510040883200
20 243290200817664000
21 4644631106519040000
22 102181884343418880000
23 2154334728240414720000

List of values

[1, 2, 3, 12, 40, 240, 1260, 10080, 72576, 725760, 6652800, 79833600, 889574400, 12454041600, 163459296000, 2615348736000, 39520825344000, 711374856192000, 12164510040883200, 243290200817664000, 4644631106519040000, 102181884343418880000, 2154334728240414720000]

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

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