The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 12 |
| 4 | 6 |
| 5 | 180 |
| 6 | 10 |
| 7 | 560 |
| 8 | 1260 |
| 9 | 12600 |
| 10 | 1260 |
| 11 | 166320 |
| 12 | 13860 |
| 13 | 2522520 |
| 14 | 2702700 |
[1,1,12,6,180,10,560,1260,12600,1260,166320,13860, 2522520,2702700] |