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| n | a(n) |
|---|---|
| 1 | 9 |
| 2 | 81 |
| 3 | 289 |
| 4 | 961 |
| 5 | 3249 |
| 6 | 11025 |
| 7 | 37249 |
| 8 | 126025 |
| 9 | 426409 |
| 10 | 1442401 |
| 11 | 4879681 |
| 12 | 16507969 |
| 13 | 55845729 |
| 14 | 188925025 |
| 15 | 639128961 |
| 16 | 2162157001 |
| 17 | 7314525625 |
| 18 | 24744863025 |
| 19 | 83711270241 |
| 20 | 283193201281 |
| 21 | 958035736849 |
| 22 | 3241011678961 |
| 23 | 10964263980289 |
[9,81,289,961,3249,11025,37249,126025,426409, 1442401,4879681,16507969,55845729,188925025, 639128961,2162157001,7314525625,24744863025, 83711270241,283193201281,958035736849, 3241011678961,10964263980289] |