The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 16 |
| 3 | 2592 |
| 4 | 15925248 |
| 5 | 5971968000000 |
| 6 | 200612260085760000000 |
| 7 | 832672625439347520307200000000 |
| 8 | 563267516889491698929453880049664000000000 |
[2,16,2592,15925248,5971968000000, 200612260085760000000, 832672625439347520307200000000, 563267516889491698929453880049664000000000] |