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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 47 |
| 3 | 1087 |
| 4 | 8647 |
| 5 | 29167 |
| 6 | 69127 |
| 7 | 87887 |
| 8 | 135007 |
| 9 | 163847 |
| 10 | 625007 |
| 11 | 1080007 |
| 12 | 1866247 |
| 13 | 3645007 |
| 14 | 5624327 |
| 15 | 10485767 |
| 16 | 13140367 |
| 17 | 15560687 |
| 18 | 18982087 |
| 19 | 19721567 |
| 20 | 22054727 |
| 21 | 24565007 |
| 22 | 32174287 |
| 23 | 33223367 |
| 24 | 42448327 |
| 25 | 43709087 |
| 26 | 59261767 |
| 27 | 60835007 |
| 28 | 76264967 |
[7,47,1087,8647,29167,69127,87887,135007,163847, 625007,1080007,1866247,3645007,5624327,10485767, 13140367,15560687,18982087,19721567,22054727, 24565007,32174287,33223367,42448327,43709087, 59261767,60835007,76264967] |