n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 6 |
4 | 21 |
5 | 100 |
6 | 645 |
7 | 4256 |
8 | 34153 |
9 | 302352 |
10 | 2966505 |
11 | 32245664 |
12 | 380114493 |
13 | 4879093440 |
14 | 67244074989 |
15 | 996485811712 |
16 | 15717842398417 |
17 | 264232448010496 |
18 | 4694489063253585 |
19 | 88283645811756544 |
20 | 1744673430747688805 |
[1,1,1,6,21,100,645,4256,34153,302352,2966505, 32245664,380114493,4879093440,67244074989, 996485811712,15717842398417,264232448010496, 4694489063253585,88283645811756544, 1744673430747688805] |