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.

A122031 a(n) = a(n - 1) + (n - 1)*a(n - 2).

Table of values

n a(n)
0 1
1 2
2 3
3 7
4 16
5 44
6 124
7 388
8 1256
9 4360
10 15664
11 59264
12 231568
13 942736
14 3953120
15 17151424
16 76448224
17 350871008
18 1650490816
19 7966168960
20 39325494464
21 198648873664
22 1024484257408
23 5394759478016
24 28957897398400

List of values

[1, 2, 3, 7, 16, 44, 124, 388, 1256, 4360, 15664, 59264, 231568, 942736, 3953120, 17151424, 76448224, 350871008, 1650490816, 7966168960, 39325494464, 198648873664, 1024484257408, 5394759478016, 28957897398400]

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

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