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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 9 |
| 2 | 97 |
| 3 | 993 |
| 4 | 9985 |
| 5 | 99969 |
| 6 | 999937 |
| 7 | 9999873 |
| 8 | 99999745 |
| 9 | 999999489 |
| 10 | 9999998977 |
| 11 | 99999997953 |
| 12 | 999999995905 |
| 13 | 9999999991809 |
| 14 | 99999999983617 |
| 15 | 999999999967233 |
| 16 | 9999999999934465 |
| 17 | 99999999999868929 |
| 18 | 999999999999737857 |
| 19 | 9999999999999475713 |
| 20 | 99999999999998951425 |
[1,9,97,993,9985,99969,999937,9999873,99999745, 999999489,9999998977,99999997953,999999995905, 9999999991809,99999999983617,999999999967233, 9999999999934465,99999999999868929, 999999999999737857,9999999999999475713, 99999999999998951425] |