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| n | a(n) |
|---|---|
| 1 | 9 |
| 2 | 99 |
| 3 | 979 |
| 4 | 999 |
| 5 | 3199 |
| 6 | 3399 |
| 7 | 5439 |
| 8 | 6399 |
| 9 | 6529 |
| 10 | 6799 |
| 11 | 6999 |
| 12 | 8709 |
| 13 | 9999 |
| 14 | 27099 |
| 15 | 40999 |
| 16 | 51099 |
| 17 | 51199 |
| 18 | 52219 |
| 19 | 52999 |
| 20 | 57499 |
| 21 | 98899 |
| 22 | 99999 |
| 23 | 219699 |
| 24 | 521109 |
| 25 | 526549 |
| 26 | 549399 |
| 27 | 570099 |
| 28 | 570999 |
| 29 | 573499 |
| 30 | 578199 |
| 31 | 659299 |
| 32 | 879099 |
| 33 | 999999 |
| 34 | 4285099 |
| 35 | 4581999 |
| 36 | 5218719 |
| 37 | 5274199 |
[9,99,979,999,3199,3399,5439,6399,6529,6799,6999, 8709,9999,27099,40999,51099,51199,52219,52999, 57499,98899,99999,219699,521109,526549,549399, 570099,570999,573499,578199,659299,879099,999999, 4285099,4581999,5218719,5274199] |