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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 15 |
| 3 | 575 |
| 4 | 5845 |
| 5 | 874853 |
| 6 | 1009743 |
| 7 | 389919909 |
| 8 | 3449575767 |
| 9 | 101622655189 |
| 10 | 109727076745 |
| 11 | 156384687564755 |
| 12 | 166320156938585 |
| 13 | 386435095871809685 |
| 14 | 406739013616700465 |
| 15 | 426379471078085225 |
| 16 | 3563283104558049475 |
| 17 | 18232291817356124003075 |
| 18 | 18937687901195398630875 |
[1,15,575,5845,874853,1009743,389919909, 3449575767,101622655189,109727076745, 156384687564755,166320156938585, 386435095871809685,406739013616700465, 426379471078085225,3563283104558049475, 18232291817356124003075,18937687901195398630875] |