n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 1 |
4 | 1 |
5 | 2 |
6 | 3 |
7 | 8 |
8 | 30 |
9 | 264 |
10 | 8160 |
11 | 2162160 |
12 | 17645379840 |
13 | 38152152118080000 |
14 | 673209215875134265982054400 |
15 | 25684380411361480419900838705211915059200000 |
[0,1,1,1,2,3,8,30,264,8160,2162160,17645379840, 38152152118080000,673209215875134265982054400, 25684380411361480419900838705211915059200000] |