| n | a(n) |
|---|---|
| 0 | 15 |
| 1 | 99 |
| 2 | 891 |
| 3 | 9825 |
| 4 | 125085 |
| 5 | 1772775 |
| 6 | 27303603 |
| 7 | 449394792 |
| 8 | 7809206685 |
| 9 | 141975690765 |
| 10 | 2681773580205 |
| 11 | 52342675041564 |
| 12 | 1051034305996356 |
| 13 | 21635329605783960 |
| 14 | 455225821135429270 |
| 15 | 9766746945640199070 |
| 16 | 213227240437260707169 |
| 17 | 4728776305725359233781 |
[15,99,891,9825,125085,1772775,27303603,449394792, 7809206685,141975690765,2681773580205, 52342675041564,1051034305996356,21635329605783960, 455225821135429270,9766746945640199070, 213227240437260707169,4728776305725359233781] |