The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 3 | 20720 |
| 4 | 2300576 |
| 5 | 187074656 |
| 6 | 13292505200 |
| 7 | 887383104080 |
| 8 | 57504128509376 |
| 9 | 3673096729270976 |
| 10 | 232977132982939280 |
| 11 | 14726467240259960240 |
| 12 | 929286203862118743776 |
| 13 | 58592152032205560862496 |
| 14 | 3692766925932013206557360 |
| 15 | 232689626985868508845398800 |
[20720,2300576,187074656,13292505200,887383104080, 57504128509376,3673096729270976, 232977132982939280,14726467240259960240, 929286203862118743776,58592152032205560862496, 3692766925932013206557360, 232689626985868508845398800] |