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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 79 |
| 3 | 799 |
| 4 | 9599 |
| 5 | 98999 |
| 6 | 599999 |
| 7 | 8999998 |
| 8 | 89998999 |
| 9 | 899999999 |
| 10 | 9899999998 |
| 11 | 99988999999 |
| 12 | 779999999999 |
| 13 | 8999899999999 |
| 14 | 89999999999999 |
| 15 | 799899999999998 |
| 16 | 9999989999999999 |
| 17 | 89999999989999999 |
| 18 | 799999999999999999 |
| 19 | 9999999999999998999 |
| 20 | 88999999999999999999 |
| 21 | 899999999899999999999 |
[1,79,799,9599,98999,599999,8999998,89998999, 899999999,9899999998,99988999999,779999999999, 8999899999999,89999999999999,799899999999998, 9999989999999999,89999999989999999, 799999999999999999,9999999999999998999, 88999999999999999999,899999999899999999999] |