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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 91 |
| 3 | 910 |
| 4 | 90091001 |
| 5 | 99918 |
| 6 | 99990899990 |
| 7 | 9999990 |
| 8 | 1111110099999900 |
| 9 | 999999910 |
| 10 | 99999990091111111001 |
| 11 | 99999999918 |
| 12 | 99999999990899999999990 |
| 13 | 9999999999990 |
[0,91,910,90091001,99918,99990899990,9999990, 1111110099999900,999999910,99999990091111111001, 99999999918,99999999990899999999990,9999999999990] |