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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 168992 |
| 2 | 5552479800 |
| 3 | 12483723152016 |
| 4 | 12976446818207108 |
| 5 | 1865501254974930048 |
[1,168992,5552479800,12483723152016, 12976446818207108,1865501254974930048] |