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| n | a(n) |
|---|---|
| 1 | 69 |
| 2 | 530 |
| 3 | 4083 |
| 4 | 31456 |
| 5 | 242326 |
| 6 | 1866789 |
| 7 | 14381065 |
| 8 | 110786519 |
| 9 | 853459216 |
| 10 | 6574740657 |
| 11 | 50649420520 |
| 12 | 390184789500 |
| 13 | 3005842285913 |
| 14 | 23155920197037 |
| 15 | 178384821680265 |
| 16 | 1374212051826542 |
| 17 | 10586431881352371 |
| 18 | 81554036605596548 |
[69,530,4083,31456,242326,1866789,14381065, 110786519,853459216,6574740657,50649420520, 390184789500,3005842285913,23155920197037, 178384821680265,1374212051826542, 10586431881352371,81554036605596548] |