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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 15 |
| 2 | 900 |
| 3 | 13500 |
| 4 | 810000 |
| 5 | 12150000 |
| 6 | 729000000 |
| 7 | 10935000000 |
| 8 | 656100000000 |
| 9 | 9841500000000 |
| 10 | 590490000000000 |
| 11 | 8857350000000000 |
| 12 | 531441000000000000 |
| 13 | 7971615000000000000 |
| 14 | 478296900000000000000 |
| 15 | 7174453500000000000000 |
[1,15,900,13500,810000,12150000,729000000, 10935000000,656100000000,9841500000000, 590490000000000,8857350000000000, 531441000000000000,7971615000000000000, 478296900000000000000,7174453500000000000000] |