n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 0 |
4 | 12 |
5 | 60 |
6 | 540 |
7 | 0 |
8 | 20160 |
9 | 181440 |
10 | 907200 |
11 | 19958400 |
12 | 359251200 |
13 | 1556755200 |
14 | 32691859200 |
15 | 0 |
16 | 10461394944000 |
17 | 177843714048000 |
18 | 1600593426432000 |
19 | 60822550204416000 |
20 | 608225502044160000 |
21 | 38318206628782080000 |
22 | 702500454861004800000 |
23 | 12926008369442488320000 |
[0,1,0,12,60,540,0,20160,181440,907200,19958400, 359251200,1556755200,32691859200,0,10461394944000, 177843714048000,1600593426432000, 60822550204416000,608225502044160000, 38318206628782080000,702500454861004800000, 12926008369442488320000] |