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| n | a(n) |
|---|---|
| 1 | 448 |
| 2 | 1018368 |
| 3 | 32505856000 |
| 4 | 21457409146880000 |
| 5 | 217683729041040447897600 |
[448,1018368,32505856000,21457409146880000, 217683729041040447897600] |