n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 2 |
3 | 30 |
4 | 456 |
5 | 7780 |
6 | 150480 |
7 | 3279234 |
8 | 79775360 |
9 | 2146962024 |
10 | 63397843200 |
11 | 2039301671110 |
12 | 71007167075328 |
13 | 2661561062560140 |
14 | 106874954684266496 |
15 | 4577827118698118250 |
16 | 208369657238965616640 |
17 | 10044458122057793060176 |
18 | 511225397403604416921600 |
[0,0,2,30,456,7780,150480,3279234,79775360, 2146962024,63397843200,2039301671110, 71007167075328,2661561062560140, 106874954684266496,4577827118698118250, 208369657238965616640,10044458122057793060176, 511225397403604416921600] |