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| n | a(n) |
|---|---|
| 1 | 9 |
| 2 | 990 |
| 3 | 999 |
| 4 | 99992 |
| 5 | 999990 |
| 6 | 9999990 |
| 7 | 49999999 |
| 8 | 999999992 |
| 9 | 999999999 |
| 10 | 99999999990 |
| 11 | 999999999999 |
| 12 | 9999999999996 |
| 13 | 39999999999999 |
| 14 | 999999999999994 |
| 15 | 9999999999999990 |
| 16 | 999999999999990992 |
| 17 | 995999999999999999 |
[9,990,999,99992,999990,9999990,49999999, 999999992,999999999,99999999990,999999999999, 9999999999996,39999999999999,999999999999994, 9999999999999990,999999999999990992, 995999999999999999] |