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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 13 |
| 3 | 10795 |
| 4 | 773568107 |
| 5 | 4598900066440609 |
| 6 | 2286173927365217148894607 |
[1,13,10795,773568107,4598900066440609, 2286173927365217148894607] |