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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 9 |
| 3 | 25 |
| 4 | 81 |
| 5 | 241 |
| 6 | 719 |
| 7 | 2181 |
| 8 | 6543 |
| 9 | 19623 |
| 10 | 58983 |
| 11 | 176995 |
| 12 | 531045 |
| 13 | 1593739 |
| 14 | 4781741 |
| 15 | 14346105 |
| 16 | 43041933 |
| 17 | 129130449 |
| 18 | 387399819 |
| 19 | 1162223437 |
| 20 | 3486708387 |
| 21 | 10460197183 |
| 22 | 31380761819 |
| 23 | 94142587347 |
| 24 | 282428344593 |
| 25 | 847286292987 |
| 26 | 2541861239481 |
[3,9,25,81,241,719,2181,6543,19623,58983,176995, 531045,1593739,4781741,14346105,43041933, 129130449,387399819,1162223437,3486708387, 10460197183,31380761819,94142587347,282428344593, 847286292987,2541861239481] |