The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 10 |
| 4 | 3360 |
| 5 | 1753920 |
| 6 | 1812888000 |
| 7 | 3158396841600 |
| 8 | 8496995611104000 |
| 9 | 33199738565849856000 |
| 10 | 180116271096528678912000 |
| 11 | 1310903590075375049994240000 |
| 12 | 12454930569778045924343408640000 |
[1,10,3360,1753920,1812888000,3158396841600, 8496995611104000,33199738565849856000, 180116271096528678912000, 1310903590075375049994240000, 12454930569778045924343408640000] |