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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 27 |
| 3 | 343 |
| 4 | 3375 |
| 5 | 29791 |
| 6 | 250047 |
| 7 | 2048383 |
| 8 | 16581375 |
| 9 | 133432831 |
| 10 | 1070599167 |
| 11 | 8577357823 |
| 12 | 68669157375 |
| 13 | 549554511871 |
| 14 | 4397241253887 |
| 15 | 35181150961663 |
| 16 | 281462092005375 |
| 17 | 2251748274470911 |
| 18 | 18014192351838207 |
| 19 | 144114363443707903 |
[1,27,343,3375,29791,250047,2048383,16581375, 133432831,1070599167,8577357823,68669157375, 549554511871,4397241253887,35181150961663, 281462092005375,2251748274470911, 18014192351838207,144114363443707903] |