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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 81 |
| 3 | 987 |
| 4 | 13401 |
| 5 | 178311 |
| 6 | 2381469 |
| 7 | 31783299 |
| 8 | 424240833 |
| 9 | 5662582239 |
| 10 | 75582071565 |
| 11 | 1008840783171 |
| 12 | 13465626160209 |
| 13 | 179734091085543 |
| 14 | 2399022766771749 |
| 15 | 32021249796760479 |
| 16 | 427407548197383945 |
| 17 | 5704874525707845543 |
[3,81,987,13401,178311,2381469,31783299,424240833, 5662582239,75582071565,1008840783171, 13465626160209,179734091085543,2399022766771749, 32021249796760479,427407548197383945, 5704874525707845543] |