n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 25 |
5 | 135 |
6 | 913 |
7 | 7499 |
8 | 73191 |
9 | 833597 |
10 | 10917343 |
11 | 162402263 |
12 | 2715430931 |
13 | 50576761471 |
14 | 1041203832858 |
15 | 23529845888598 |
[1,1,2,6,25,135,913,7499,73191,833597,10917343, 162402263,2715430931,50576761471,1041203832858, 23529845888598] |