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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 27 |
| 2 | 423 |
| 3 | 5607 |
| 4 | 85683 |
| 5 | 1337727 |
| 6 | 21331503 |
| 7 | 344238579 |
| 8 | 5599424547 |
| 9 | 91540779903 |
| 10 | 1501346684863 |
| 11 | 24673460611915 |
| 12 | 406009294231251 |
| 13 | 6686397678162879 |
| 14 | 110171301582051951 |
| 15 | 1815861973753907787 |
| 16 | 29935310771775478339 |
[1,27,423,5607,85683,1337727,21331503,344238579, 5599424547,91540779903,1501346684863, 24673460611915,406009294231251,6686397678162879, 110171301582051951,1815861973753907787, 29935310771775478339] |