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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 135 |
| 3 | 587 |
| 4 | 4015 |
| 5 | 40073 |
| 6 | 270549 |
| 7 | 1942323 |
| 8 | 15984991 |
| 9 | 119888365 |
| 10 | 894632985 |
| 11 | 6977123487 |
| 12 | 53362780811 |
| 13 | 405255680609 |
| 14 | 3117495042837 |
| 15 | 23903072796727 |
| 16 | 182681815961381 |
| 17 | 1400954811635395 |
| 18 | 10740879929227211 |
| 19 | 82253911392409687 |
[7,135,587,4015,40073,270549,1942323,15984991, 119888365,894632985,6977123487,53362780811, 405255680609,3117495042837,23903072796727, 182681815961381,1400954811635395, 10740879929227211,82253911392409687] |