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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 49 |
| 3 | 343 |
| 4 | 2401 |
| 5 | 16807 |
| 6 | 116929 |
| 7 | 803383 |
| 8 | 5432161 |
| 9 | 36120007 |
| 10 | 236404609 |
| 11 | 1525601623 |
| 12 | 9726181921 |
| 13 | 61371928807 |
| 14 | 383929313089 |
| 15 | 2384606035063 |
| 16 | 14723095123681 |
| 17 | 90457525939207 |
| 18 | 553507860826369 |
| 19 | 3375536272503703 |
| 20 | 20528377102849441 |
| 21 | 124556950506727207 |
[7,49,343,2401,16807,116929,803383,5432161, 36120007,236404609,1525601623,9726181921, 61371928807,383929313089,2384606035063, 14723095123681,90457525939207,553507860826369, 3375536272503703,20528377102849441, 124556950506727207] |