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| n | a(n) |
|---|---|
| 1 | 29999999 |
| 2 | 39899999 |
| 3 | 39999899 |
| 4 | 48999989 |
| 5 | 49898999 |
| 6 | 49899989 |
| 7 | 49979999 |
| 8 | 49997999 |
| 9 | 57899999 |
| 10 | 57998999 |
| 11 | 57999899 |
| 12 | 58899989 |
| 13 | 58989899 |
| 14 | 58998899 |
| 15 | 59879999 |
| 16 | 59898899 |
| 17 | 59898989 |
| 18 | 59979989 |
| 19 | 59987999 |
| 20 | 59988989 |
| 21 | 59999879 |
[29999999,39899999,39999899,48999989,49898999, 49899989,49979999,49997999,57899999,57998999, 57999899,58899989,58989899,58998899,59879999, 59898899,59898989,59979989,59987999,59988989, 59999879] |