n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 3 |
5 | 6 |
6 | 14 |
7 | 32 |
8 | 90 |
9 | 279 |
10 | 942 |
11 | 3468 |
12 | 13777 |
13 | 57747 |
14 | 254671 |
15 | 1170565 |
16 | 5580706 |
17 | 27487418 |
18 | 139477796 |
19 | 727458338 |
20 | 3893078684 |
21 | 21346838204 |
22 | 119787629215 |
23 | 687200870250 |
[1,1,2,3,6,14,32,90,279,942,3468,13777,57747, 254671,1170565,5580706,27487418,139477796, 727458338,3893078684,21346838204,119787629215, 687200870250] |