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.

A291286 a(0)=1, a(1)=2, thereafter a(n) = n*a(n-1)+(n-1)*(n-2)*a(n-2).

Table of values

n a(n)
0 1
1 2
2 4
3 16
4 88
5 632
6 5552
7 57824
8 695776
9 9500128
10 145097152
11 2451080192
12 45373649024
13 913400022656
14 19865889564928
15 464227147597312
16 11599471170191872
17 308605525316616704
18 8709955613991289856
19 259922447412719218688
20 8177253768239405504512

List of values

[1, 2, 4, 16, 88, 632, 5552, 57824, 695776, 9500128, 145097152, 2451080192, 45373649024, 913400022656, 19865889564928, 464227147597312, 11599471170191872, 308605525316616704, 8709955613991289856, 259922447412719218688, 8177253768239405504512]