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| n | a(n) |
|---|---|
| 1 | 10 |
| 2 | 99 |
| 3 | 989 |
| 4 | 9889 |
| 5 | 98889 |
| 6 | 988889 |
| 7 | 9888889 |
| 8 | 98888889 |
| 9 | 988888889 |
| 10 | 9888888889 |
| 11 | 98888888889 |
| 12 | 988888888889 |
| 13 | 9888888888889 |
| 14 | 98888888888889 |
| 15 | 988888888888889 |
| 16 | 9888888888888889 |
| 17 | 98888888888888889 |
| 18 | 988888888888888889 |
| 19 | 9888888888888888889 |
| 20 | 98888888888888888889 |
[10,99,989,9889,98889,988889,9888889,98888889, 988888889,9888888889,98888888889,988888888889, 9888888888889,98888888888889,988888888888889, 9888888888888889,98888888888888889, 988888888888888889,9888888888888888889, 98888888888888888889] |