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| n | a(n) |
|---|---|
| 1 | 9 |
| 2 | 90 |
| 3 | 900 |
| 4 | 9000 |
| 5 | 90000 |
| 6 | 900000 |
| 7 | 7000000 |
| 8 | 90000000 |
| 9 | 900000000 |
| 10 | 90000000000 |
| 11 | 0 |
| 12 | 900000000000 |
| 13 | 0 |
| 14 | 70000000000000 |
| 15 | 900000000000000 |
[9,90,900,9000,90000,900000,7000000,90000000, 900000000,90000000000,0,900000000000,0, 70000000000000,900000000000000] |