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.

A052649 Expansion of e.g.f. (2+x-x^2)/(1-x)^2.

Table of values

n a(n)
0 2
1 5
2 14
3 54
4 264
5 1560
6 10800
7 85680
8 766080
9 7620480
10 83462400
11 997920000
12 12933043200
13 180583603200
14 2702527027200
15 43153254144000
16 732297646080000
17 13160434839552000
18 249692574523392000
19 4987449116762112000
20 104614786351595520000
21 2299092397726924800000

List of values

[2, 5, 14, 54, 264, 1560, 10800, 85680, 766080, 7620480, 83462400, 997920000, 12933043200, 180583603200, 2702527027200, 43153254144000, 732297646080000, 13160434839552000, 249692574523392000, 4987449116762112000, 104614786351595520000, 2299092397726924800000]

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

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