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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 27 |
| 3 | 91 |
| 4 | 291 |
| 5 | 907 |
| 6 | 2787 |
| 7 | 8491 |
| 8 | 25731 |
| 9 | 77707 |
| 10 | 234147 |
| 11 | 704491 |
| 12 | 2117571 |
| 13 | 6360907 |
| 14 | 19099107 |
| 15 | 57330091 |
| 16 | 172055811 |
| 17 | 516298507 |
| 18 | 1549157667 |
| 19 | 4647997291 |
| 20 | 13945040451 |
| 21 | 41837218507 |
| 22 | 125515849827 |
| 23 | 376555938091 |
| 24 | 1129684591491 |
| 25 | 3389087328907 |
| 26 | 10167329095587 |
[1,7,27,91,291,907,2787,8491,25731,77707,234147, 704491,2117571,6360907,19099107,57330091, 172055811,516298507,1549157667,4647997291, 13945040451,41837218507,125515849827,376555938091, 1129684591491,3389087328907,10167329095587] |