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| n | a(n) |
|---|---|
| 1 | 81 |
| 2 | 459 |
| 3 | 2601 |
| 4 | 15759 |
| 5 | 95481 |
| 6 | 586791 |
| 7 | 3606201 |
| 8 | 22235391 |
| 9 | 137100681 |
| 10 | 845893287 |
| 11 | 5219051049 |
| 12 | 32205712671 |
| 13 | 198734965209 |
| 14 | 1226388884391 |
| 15 | 7568017506009 |
| 16 | 46702383172479 |
| 17 | 288201314579049 |
| 18 | 1778498201192679 |
| 19 | 10975161082334409 |
[81,459,2601,15759,95481,586791,3606201,22235391, 137100681,845893287,5219051049,32205712671, 198734965209,1226388884391,7568017506009, 46702383172479,288201314579049,1778498201192679, 10975161082334409] |