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| n | a(n) |
|---|---|
| 2 | 2 |
| 3 | 8 |
| 4 | 192 |
| 5 | 50752 |
| 6 | 64264704 |
| 7 | 2591115982336 |
| 8 | 458135084510273536 |
| 9 | 5255224440224669298917376 |
[2,8,192,50752,64264704,2591115982336, 458135084510273536,5255224440224669298917376] |