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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 9 |
| 3 | 999 |
| 4 | 999999999 |
| 5 | 29799999792 |
| 6 | 39789998793 |
| 7 | 39989598993 |
| 8 | 68899199886 |
| 9 | 68899199886 |
| 10 | 68899199886 |
| 11 | 68899199886 |
| 12 | 68899199886 |
| 13 | 2699657569962 |
| 14 | 146189959981641 |
| 15 | 191388777883191 |
| 16 | 191388777883191 |
| 17 | 18641845754814681 |
[1,3,9,999,999999999,29799999792,39789998793, 39989598993,68899199886,68899199886,68899199886, 68899199886,68899199886,2699657569962, 146189959981641,191388777883191,191388777883191, 18641845754814681] |