n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 30 |
4 | 240 |
5 | 2520 |
6 | 32400 |
7 | 478800 |
8 | 8104320 |
9 | 154586880 |
10 | 3273177600 |
11 | 76241088000 |
12 | 1937561472000 |
13 | 53340660172800 |
14 | 1581414202368000 |
15 | 50234310846720000 |
16 | 1702089880178688000 |
17 | 61276407362666496000 |
[1,1,4,30,240,2520,32400,478800,8104320,154586880, 3273177600,76241088000,1937561472000, 53340660172800,1581414202368000,50234310846720000, 1702089880178688000,61276407362666496000] |