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.

A001710 Order of alternating group A_n, or number of even permutations of n letters.

Table of values

n a(n)
0 1
1 1
2 1
3 3
4 12
5 60
6 360
7 2520
8 20160
9 181440
10 1814400
11 19958400
12 239500800
13 3113510400
14 43589145600
15 653837184000
16 10461394944000
17 177843714048000
18 3201186852864000
19 60822550204416000
20 1216451004088320000
21 25545471085854720000
22 562000363888803840000

List of values

[1, 1, 1, 3, 12, 60, 360, 2520, 20160, 181440, 1814400, 19958400, 239500800, 3113510400, 43589145600, 653837184000, 10461394944000, 177843714048000, 3201186852864000, 60822550204416000, 1216451004088320000, 25545471085854720000, 562000363888803840000]

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

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