n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 15 |
3 | 84 |
4 | 495 |
5 | 3003 |
6 | 18564 |
7 | 116280 |
8 | 735471 |
9 | 4686825 |
10 | 30045015 |
11 | 193536720 |
12 | 1251677700 |
13 | 8122425444 |
14 | 52860229080 |
15 | 344867425584 |
16 | 2254848913647 |
17 | 14771069086725 |
18 | 96926348578605 |
19 | 636983969321700 |
20 | 4191844505805495 |
21 | 27619435402363035 |
[1,3,15,84,495,3003,18564,116280,735471,4686825, 30045015,193536720,1251677700,8122425444, 52860229080,344867425584,2254848913647, 14771069086725,96926348578605,636983969321700, 4191844505805495,27619435402363035] |