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| n | a(n) |
|---|---|
| 1 | 512 |
| 2 | 3995648 |
| 3 | 2889212890624 |
| 4 | 18705093636361328125 |
| 5 | 19810215665260426138787109374 |
[512,3995648,2889212890624,18705093636361328125, 19810215665260426138787109374] |