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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 9 |
| 3 | 81 |
| 4 | 11881 |
| 5 | 19881 |
| 6 | 111999889 |
| 7 | 1199998881 |
| 8 | 1981191998999889 |
| 9 | 11181188899981881 |
| 10 | 889111189818189198888889 |
| 11 | 18891818199881191889889889 |
| 12 | 8819999189981919818818919999881 |
[1,9,81,11881,19881,111999889,1199998881, 1981191998999889,11181188899981881, 889111189818189198888889, 18891818199881191889889889, 8819999189981919818818919999881] |