n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 15 |
4 | 40 |
5 | 345 |
6 | 2586 |
7 | 12691 |
8 | 184752 |
9 | 1398249 |
10 | 11704510 |
11 | 175017051 |
12 | 1967695236 |
13 | 20087686801 |
14 | 255021799774 |
15 | 4806149903535 |
16 | 56671523111776 |
17 | 701133947596833 |
18 | 13717397944130022 |
19 | 239656702550550643 |
20 | 3664885434889252860 |
21 | 50293288049723865321 |
22 | 1193861525054124696022 |
[1,1,2,15,40,345,2586,12691,184752,1398249, 11704510,175017051,1967695236,20087686801, 255021799774,4806149903535,56671523111776, 701133947596833,13717397944130022, 239656702550550643,3664885434889252860, 50293288049723865321,1193861525054124696022] |