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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 9 |
| 3 | 33 |
| 4 | 123 |
| 5 | 459 |
| 6 | 1767 |
| 7 | 6795 |
| 8 | 26397 |
| 9 | 103323 |
| 10 | 404439 |
| 11 | 1591917 |
| 12 | 6274389 |
| 13 | 24780489 |
| 14 | 98110263 |
| 15 | 388610895 |
| 16 | 1541837565 |
| 17 | 6122129877 |
| 18 | 24327902433 |
| 19 | 96767761083 |
| 20 | 385038905697 |
| 21 | 1533118174923 |
| 22 | 6107008497819 |
| 23 | 24335988943143 |
| 24 | 97021648253361 |
| 25 | 386885931518703 |
| 26 | 1543276950241995 |
| 27 | 6157531782523065 |
[1,3,9,33,123,459,1767,6795,26397,103323,404439, 1591917,6274389,24780489,98110263,388610895, 1541837565,6122129877,24327902433,96767761083, 385038905697,1533118174923,6107008497819, 24335988943143,97021648253361,386885931518703, 1543276950241995,6157531782523065] |