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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 10 |
| 3 | 110 |
| 4 | 1100 |
| 5 | 11110 |
| 6 | 110990 |
| 7 | 1111110 |
| 8 | 11110000 |
| 9 | 111111000 |
| 10 | 1111099990 |
| 11 | 11111111110 |
| 12 | 111110998900 |
| 13 | 1111111111110 |
| 14 | 11111109999990 |
| 15 | 111111111099890 |
| 16 | 1111111100000000 |
| 17 | 11111111111111110 |
| 18 | 111111110999889000 |
| 19 | 1111111111111111110 |
| 20 | 11111111109999998900 |
| 21 | 111111111111109999890 |
[1,10,110,1100,11110,110990,1111110,11110000, 111111000,1111099990,11111111110,111110998900, 1111111111110,11111109999990,111111111099890, 1111111100000000,11111111111111110, 111111110999889000,1111111111111111110, 11111111109999998900,111111111111109999890] |