n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 540 |
3 | 21120 |
4 | 286740 |
5 | 2132352 |
6 | 10878300 |
7 | 44012160 |
8 | 146719620 |
9 | 417436800 |
10 | 1093070376 |
11 | 2572283520 |
12 | 5570541780 |
13 | 11568510720 |
14 | 22583167200 |
15 | 41422741632 |
16 | 75113550180 |
17 | 129368897280 |
18 | 214148621340 |
[1,0,540,21120,286740,2132352,10878300,44012160, 146719620,417436800,1093070376,2572283520, 5570541780,11568510720,22583167200,41422741632, 75113550180,129368897280,214148621340] |