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| n | a(n) |
|---|---|
| 1 | 13 |
| 2 | 181 |
| 3 | 2521 |
| 4 | 76543 |
| 5 | 489061 |
| 6 | 6811741 |
| 7 | 1321442641 |
| 8 | 18405321661 |
| 9 | 381765135195632792959100810331957408101589361 |
[13,181,2521,76543,489061,6811741,1321442641, 18405321661, 381765135195632792959100810331957408101589361] |