n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 2 |
4 | 15 |
5 | 68 |
6 | 401 |
7 | 2179 |
8 | 23229 |
9 | 213332 |
10 | 2642772 |
11 | 38611992 |
12 | 723385584 |
13 | 16909827584 |
14 | 343510569552 |
15 | 9601049357952 |
16 | 305917702264416 |
[1,2,2,15,68,401,2179,23229,213332,2642772, 38611992,723385584,16909827584,343510569552, 9601049357952,305917702264416] |