n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 22 |
4 | 105 |
5 | 631 |
6 | 4603 |
7 | 39469 |
8 | 388870 |
9 | 4327322 |
10 | 53670985 |
11 | 734069672 |
12 | 10975379510 |
13 | 178080287645 |
14 | 3116286236549 |
15 | 58502460526469 |
[1,2,6,22,105,631,4603,39469,388870,4327322, 53670985,734069672,10975379510,178080287645, 3116286236549,58502460526469] |