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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 5 |
| 2 | 9 |
| 3 | 89 |
| 4 | 8009 |
| 5 | 64152089 |
| 6 | 4115490587216009 |
| 7 | 16937262773463574696951813104089 |
[2,5,9,89,8009,64152089,4115490587216009, 16937262773463574696951813104089] |