n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 4 |
3 | 10 |
4 | 30 |
5 | 110 |
6 | 494 |
7 | 2734 |
8 | 18734 |
9 | 159278 |
10 | 1685550 |
11 | 22268974 |
12 | 367653934 |
13 | 7597868078 |
14 | 196929315886 |
15 | 6402998805550 |
16 | 261393582040110 |
17 | 13416320169124910 |
18 | 865576139256079406 |
19 | 70227589169019724846 |
20 | 7172766017169503134766 |
21 | 921829147482582383174702 |
[1,2,4,10,30,110,494,2734,18734,159278,1685550, 22268974,367653934,7597868078,196929315886, 6402998805550,261393582040110,13416320169124910, 865576139256079406,70227589169019724846, 7172766017169503134766,921829147482582383174702] |