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.

A291287 a(0)=a(1)=1, a(2)=3, thereafter a(n) = n*a(n-1)+(n-1)*(n-2)*a(n-2).

Table of values

n a(n)
0 1
1 1
2 3
3 11
4 62
5 442
6 3892
7 40504
8 487496
9 6655688
10 101656592
11 1717234432
12 31789038304
13 639932442976
14 13918144177088
15 325239867277952
16 8126648153635712
17 216210586758515584
18 6102238859442194176
19 182102977877507458048
20 5729025247479379569152

List of values

[1, 1, 3, 11, 62, 442, 3892, 40504, 487496, 6655688, 101656592, 1717234432, 31789038304, 639932442976, 13918144177088, 325239867277952, 8126648153635712, 216210586758515584, 6102238859442194176, 182102977877507458048, 5729025247479379569152]