n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 2 |
3 | 0 |
4 | 24 |
5 | 120 |
6 | 720 |
7 | 10080 |
8 | 80640 |
9 | 1088640 |
10 | 14515200 |
11 | 199584000 |
12 | 3353011200 |
13 | 56043187200 |
14 | 1046139494400 |
15 | 20922789888000 |
16 | 439378587648000 |
17 | 9959247986688000 |
18 | 236887827111936000 |
19 | 5960609920032768000 |
[1,0,2,0,24,120,720,10080,80640,1088640,14515200, 199584000,3353011200,56043187200,1046139494400, 20922789888000,439378587648000,9959247986688000, 236887827111936000,5960609920032768000] |