The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 12 |
| 3 | 1440 |
| 4 | 7257600 |
| 5 | 289700167680000 |
| 6 | 1803968969906847744000000 |
| 7 | 641649083271157094762019815424000000000 |
| 8 | 78053467161754909919949074014980107579424768000000000000 |
[1,2,12,1440,7257600,289700167680000, 1803968969906847744000000, 641649083271157094762019815424000000000, 78053467161754909919949074014980107579424768000000\ 000000] |