n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 24 |
6 | 360 |
7 | 3360 |
8 | 25200 |
9 | 166824 |
10 | 1020600 |
11 | 5921520 |
12 | 33105600 |
13 | 180204024 |
14 | 961800840 |
15 | 5058406080 |
16 | 26308573200 |
17 | 135666039624 |
18 | 694994293080 |
19 | 3542142833040 |
20 | 17980946172000 |
21 | 90990301641624 |
[0,0,0,0,24,360,3360,25200,166824,1020600,5921520, 33105600,180204024,961800840,5058406080, 26308573200,135666039624,694994293080, 3542142833040,17980946172000,90990301641624] |