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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 11 |
| 3 | 110 |
| 4 | 1109 |
| 5 | 11099 |
| 6 | 110999 |
| 7 | 1109999 |
| 8 | 11099999 |
| 9 | 110999999 |
| 10 | 1109999999 |
| 11 | 11099999999 |
| 12 | 110999999990 |
| 13 | 1109999999909 |
| 14 | 11099999999099 |
| 15 | 110999999990999 |
| 16 | 1109999999909990 |
| 17 | 11099999999099900 |
| 18 | 110999999990999009 |
| 19 | 1109999999909990099 |
| 20 | 11099999999099900999 |
| 21 | 110999999990999009990 |
| 22 | 1109999999909990099900 |
| 23 | 11099999999099900999000 |
[1,11,110,1109,11099,110999,1109999,11099999, 110999999,1109999999,11099999999,110999999990, 1109999999909,11099999999099,110999999990999, 1109999999909990,11099999999099900, 110999999990999009,1109999999909990099, 11099999999099900999,110999999990999009990, 1109999999909990099900,11099999999099900999000] |