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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 10 |
| 3 | 109 |
| 4 | 1099 |
| 5 | 11098 |
| 6 | 110989 |
| 7 | 1110988 |
| 8 | 11109988 |
| 9 | 111109888 |
| 10 | 1111099879 |
| 11 | 11111099878 |
| 12 | 111110998888 |
| 13 | 1111110998887 |
| 14 | 11111109998878 |
| 15 | 111111109988779 |
| 16 | 1111111099988779 |
| 17 | 11111111099988778 |
| 18 | 111111110999888878 |
| 19 | 1111111110999888877 |
| 20 | 11111111109999887887 |
[1,10,109,1099,11098,110989,1110988,11109988, 111109888,1111099879,11111099878,111110998888, 1111110998887,11111109998878,111111109988779, 1111111099988779,11111111099988778, 111111110999888878,1111111110999888877, 11111111109999887887] |