n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 0 |
3 | 1 |
4 | 3 |
5 | 27 |
6 | 240 |
7 | 2985 |
8 | 42840 |
9 | 731745 |
10 | 14243040 |
11 | 313570845 |
12 | 7683984000 |
13 | 207685374435 |
14 | 6135743053440 |
15 | 196754537704725 |
16 | 6805907485977600 |
17 | 252620143716765825 |
18 | 10015402456976716800 |
19 | 422410127508300756825 |
20 | 18884777200534941696000 |
[1,1,0,1,3,27,240,2985,42840,731745,14243040, 313570845,7683984000,207685374435,6135743053440, 196754537704725,6805907485977600, 252620143716765825,10015402456976716800, 422410127508300756825,18884777200534941696000] |