n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 20 |
4 | 2800 |
5 | 16464000 |
6 | 12778698240000 |
7 | 4254956888736153600000 |
8 | 2026001446509988558521630720000000 |
9 | 4690285643617101997210180025102660272128000000000 |
[1,1,2,20,2800,16464000,12778698240000, 4254956888736153600000, 2026001446509988558521630720000000, 4690285643617101997210180025102660272128000000000] |