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.

A052612 Expansion of e.g.f. x*(2+x)/(1-x^2).

Table of values

n a(n)
0 0
1 2
2 2
3 12
4 24
5 240
6 720
7 10080
8 40320
9 725760
10 3628800
11 79833600
12 479001600
13 12454041600
14 87178291200
15 2615348736000
16 20922789888000
17 711374856192000
18 6402373705728000
19 243290200817664000
20 2432902008176640000
21 102181884343418880000
22 1124000727777607680000

List of values

[0, 2, 2, 12, 24, 240, 720, 10080, 40320, 725760, 3628800, 79833600, 479001600, 12454041600, 87178291200, 2615348736000, 20922789888000, 711374856192000, 6402373705728000, 243290200817664000, 2432902008176640000, 102181884343418880000, 1124000727777607680000]

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

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