n | a(n) |
---|---|
1 | 3 |
2 | 9 |
3 | 20 |
4 | 44 |
5 | 121 |
6 | 585 |
7 | 9506 |
8 | 1844164 |
9 | 53139700920 |
10 | 34862071776136405511 |
11 | 12153640485244865516062665215354311711 |
12 | 12153640485244865516062665215354311711 |
[3,9,20,44,121,585,9506,1844164,53139700920, 34862071776136405511, 12153640485244865516062665215354311711, 12153640485244865516062665215354311711] |