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| n | a(n) |
|---|---|
| 1 | 9 |
| 2 | 299 |
| 3 | 5999 |
| 4 | 19999 |
| 5 | 899999 |
| 6 | 5999999 |
| 7 | 79999999 |
| 8 | 299999999 |
| 9 | 1999999999 |
| 10 | 49999999999 |
| 11 | 499999999999 |
| 12 | 1999999999999 |
| 13 | 29999999999999 |
| 14 | 199999999999999 |
| 15 | 1999999999999999 |
| 16 | 29999999999999999 |
| 17 | 599999999999999999 |
[9,299,5999,19999,899999,5999999,79999999, 299999999,1999999999,49999999999,499999999999, 1999999999999,29999999999999,199999999999999, 1999999999999999,29999999999999999, 599999999999999999] |