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| n | a(n) |
|---|---|
| 1 | 15 |
| 2 | 315 |
| 3 | 5760 |
| 4 | 103635 |
| 5 | 1860375 |
| 6 | 33384960 |
| 7 | 599073735 |
| 8 | 10749954915 |
| 9 | 192900147840 |
| 10 | 346145279 |
| 11 | 2875 |
| 12 | 62113250350815 |
| 13 | 1114577054115840 |
| 14 | 20000273725289535 |
| 15 | 358890350005167435 |
| 16 | 644002 |
| 17 | 6026378384000 |
| 18 | 115561578124833652035 |
[15,315,5760,103635,1860375,33384960,599073735, 10749954915,192900147840,346145279,2875, 62113250350815,1114577054115840,20000273725289535, 358890350005167435,644002,6026378384000, 115561578124833652035] |