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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 15 |
| 4 | 91 |
| 5 | 641 |
| 6 | 5147 |
| 7 | 46433 |
| 8 | 465081 |
| 9 | 5121789 |
| 10 | 61513799 |
| 11 | 800196799 |
| 12 | 11208394387 |
| 13 | 168193068805 |
| 14 | 2691956450679 |
| 15 | 45775335405729 |
| 16 | 824136306116113 |
| 17 | 15661462041469817 |
| 18 | 313277888390065739 |
| 19 | 6579708440058166031 |
[1,3,15,91,641,5147,46433,465081,5121789,61513799, 800196799,11208394387,168193068805,2691956450679, 45775335405729,824136306116113,15661462041469817, 313277888390065739,6579708440058166031] |