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| n | a(n) |
|---|---|
| 1 | 42 |
| 2 | 387 |
| 3 | 2840 |
| 4 | 23584 |
| 5 | 197605 |
| 6 | 1601683 |
| 7 | 13087828 |
| 8 | 107398293 |
| 9 | 878894477 |
| 10 | 7193285719 |
| 11 | 58898156726 |
| 12 | 482180316552 |
| 13 | 3947375486172 |
| 14 | 32316205361007 |
| 15 | 264563453161915 |
| 16 | 2165898853276949 |
| 17 | 17731567206469017 |
| 18 | 145163047328289678 |
[42,387,2840,23584,197605,1601683,13087828, 107398293,878894477,7193285719,58898156726, 482180316552,3947375486172,32316205361007, 264563453161915,2165898853276949, 17731567206469017,145163047328289678] |