n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 24 |
5 | 120 |
6 | 720 |
7 | 5040 |
8 | 60480 |
9 | 725760 |
10 | 9072000 |
11 | 119750400 |
12 | 1756339200 |
13 | 28021593600 |
14 | 479480601600 |
15 | 8717829120000 |
16 | 168254102016000 |
17 | 3438311804928000 |
18 | 74160828758016000 |
19 | 1682757222322176000 |
20 | 40061786401308672000 |
21 | 998402161605488640000 |
[1,0,0,0,24,120,720,5040,60480,725760,9072000, 119750400,1756339200,28021593600,479480601600, 8717829120000,168254102016000,3438311804928000, 74160828758016000,1682757222322176000, 40061786401308672000,998402161605488640000] |