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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 9 |
| 3 | 999 |
| 4 | 999999999 |
| 5 | 4899999987 |
| 6 | 19899999972 |
| 7 | 28999899936 |
| 8 | 49989892689 |
| 9 | 49999917897 |
| 10 | 68899199886 |
| 11 | 68899199886 |
| 12 | 68899199886 |
| 13 | 2678052898989 |
| 14 | 17902896898419 |
| 15 | 137530987695297 |
| 16 | 189281899170567 |
| 17 | 368055404997498 |
[1,3,9,999,999999999,4899999987,19899999972, 28999899936,49989892689,49999917897,68899199886, 68899199886,68899199886,2678052898989, 17902896898419,137530987695297,189281899170567, 368055404997498] |