n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 6 |
3 | 42 |
4 | 408 |
5 | 4920 |
6 | 71280 |
7 | 1204560 |
8 | 23264640 |
9 | 505491840 |
10 | 12203654400 |
11 | 324084499200 |
12 | 9388910361600 |
13 | 294668851276800 |
14 | 9959509521561600 |
15 | 360665744414976000 |
16 | 13931586106454016000 |
17 | 571775010100310016000 |
[1,1,6,42,408,4920,71280,1204560,23264640, 505491840,12203654400,324084499200,9388910361600, 294668851276800,9959509521561600, 360665744414976000,13931586106454016000, 571775010100310016000] |