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| n | a(n) |
|---|---|
| 1 | 9 |
| 2 | 81 |
| 3 | 217 |
| 4 | 530 |
| 5 | 1459 |
| 6 | 3947 |
| 7 | 11306 |
| 8 | 32445 |
| 9 | 96201 |
| 10 | 286920 |
| 11 | 873201 |
| 12 | 2673027 |
| 13 | 8288284 |
| 14 | 25824249 |
| 15 | 81128201 |
| 16 | 255825008 |
| 17 | 811028901 |
| 18 | 2578371055 |
| 19 | 8225731808 |
| 20 | 26296176189 |
| 21 | 84258830581 |
| 22 | 270382678904 |
| 23 | 868986130961 |
| 24 | 2795785995547 |
| 25 | 9004226853968 |
[9,81,217,530,1459,3947,11306,32445,96201,286920, 873201,2673027,8288284,25824249,81128201, 255825008,811028901,2578371055,8225731808, 26296176189,84258830581,270382678904,868986130961, 2795785995547,9004226853968] |