n | a(n) |
---|---|
2 | 0 |
3 | 0 |
4 | 0 |
5 | 1 |
6 | 10 |
7 | 65 |
8 | 385 |
9 | 2345 |
10 | 15204 |
11 | 105880 |
12 | 793210 |
13 | 6382860 |
14 | 55020966 |
15 | 506505272 |
16 | 4963812035 |
17 | 51629528080 |
18 | 568303728360 |
19 | 6602266433920 |
20 | 80751432154868 |
21 | 1037402030622720 |
22 | 13968636570706370 |
23 | 196748236140538368 |
24 | 2893482720437769317 |
25 | 44355269272024284160 |
[0,0,0,1,10,65,385,2345,15204,105880,793210, 6382860,55020966,506505272,4963812035,51629528080, 568303728360,6602266433920,80751432154868, 1037402030622720,13968636570706370, 196748236140538368,2893482720437769317, 44355269272024284160] |