The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 6 |
| 4 | 6 |
| 5 | 24 |
| 6 | 360 |
| 7 | 720 |
| 8 | 5040 |
| 9 | 362880 |
| 10 | 1814400 |
| 11 | 23587200 |
| 12 | 1089728640 |
[1,1,6,6,24,360,720,5040,362880,1814400,23587200, 1089728640] |