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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 10 |
| 3 | 99 |
| 4 | 999 |
| 5 | 9990 |
| 6 | 99900 |
| 7 | 999000 |
| 8 | 9990000 |
| 9 | 99900000 |
| 10 | 999000000 |
| 11 | 9990000000 |
| 12 | 99899999991 |
| 13 | 998999999919 |
| 14 | 9989999999190 |
| 15 | 99899999991900 |
| 16 | 998999999918991 |
| 17 | 9989999999189910 |
| 18 | 99899999991899109 |
| 19 | 998999999918991090 |
| 20 | 9989999999189910900 |
| 21 | 99899999991899108991 |
| 22 | 998999999918991089910 |
| 23 | 9989999999189910899100 |
[1,10,99,999,9990,99900,999000,9990000,99900000, 999000000,9990000000,99899999991,998999999919, 9989999999190,99899999991900,998999999918991, 9989999999189910,99899999991899109, 998999999918991090,9989999999189910900, 99899999991899108991,998999999918991089910, 9989999999189910899100] |