n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 0 |
6 | 15 |
7 | 105 |
8 | 735 |
9 | 4095 |
10 | 26775 |
11 | 162855 |
12 | 1105335 |
13 | 7187895 |
14 | 51126075 |
15 | 356831475 |
16 | 2676468795 |
17 | 19890931515 |
18 | 156769986555 |
19 | 1232704469115 |
20 | 10178240218875 |
21 | 84190426730235 |
22 | 725667326178795 |
[0,0,0,0,0,15,105,735,4095,26775,162855,1105335, 7187895,51126075,356831475,2676468795,19890931515, 156769986555,1232704469115,10178240218875, 84190426730235,725667326178795] |