| n | a(n) |
|---|---|
| 1 | 15 |
| 2 | 225 |
| 3 | 3375 |
| 4 | 35656 |
| 5 | 377517 |
| 6 | 3810503 |
| 7 | 36890502 |
| 8 | 354894796 |
| 9 | 3368920072 |
| 10 | 31765314572 |
| 11 | 298643477857 |
| 12 | 2799075682549 |
| 13 | 26196661596588 |
| 14 | 244952250115880 |
| 15 | 2288817676141909 |
| 16 | 21378736239048787 |
| 17 | 199638668209430098 |
[15,225,3375,35656,377517,3810503,36890502, 354894796,3368920072,31765314572,298643477857, 2799075682549,26196661596588,244952250115880, 2288817676141909,21378736239048787, 199638668209430098] |