n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 6 |
3 | 90 |
4 | 2520 |
5 | 113400 |
6 | 7484400 |
7 | 681080400 |
8 | 81729648000 |
9 | 12504636144000 |
10 | 2375880867360000 |
11 | 367786358267328000 |
12 | 47683626117839712000 |
[1,1,6,90,2520,113400,7484400,681080400, 81729648000,12504636144000,2375880867360000, 367786358267328000,47683626117839712000] |