| n | a(n) |
|---|---|
| 1 | 15 |
| 2 | 483 |
| 3 | 13976 |
| 4 | 315198 |
| 5 | 5385305 |
| 6 | 71297441 |
| 7 | 759337545 |
| 8 | 6725497344 |
| 9 | 50869309436 |
| 10 | 335549742230 |
| 11 | 1963313662947 |
| 12 | 10332594393296 |
| 13 | 49485574097413 |
| 14 | 217813226273441 |
| 15 | 888570804281664 |
| 16 | 3384240524056852 |
| 17 | 12109669540486657 |
[15,483,13976,315198,5385305,71297441,759337545, 6725497344,50869309436,335549742230,1963313662947, 10332594393296,49485574097413,217813226273441, 888570804281664,3384240524056852, 12109669540486657] |