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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 48 |
| 3 | 20992 |
| 4 | 63438848 |
| 5 | 1771674009600 |
| 6 | 389343801904201728 |
| 7 | 761838097494483172065280 |
| 8 | 12136917084120610801062514786304 |
| 9 | 1696402284763369899693403606733469777920 |
[1,48,20992,63438848,1771674009600, 389343801904201728,761838097494483172065280, 12136917084120610801062514786304, 1696402284763369899693403606733469777920] |