| n | a(n) |
|---|---|
| 1 | 9 |
| 2 | 89 |
| 3 | 98 |
| 4 | 99 |
| 5 | 789 |
| 6 | 798 |
| 7 | 879 |
| 8 | 897 |
| 9 | 899 |
| 10 | 978 |
| 11 | 987 |
| 12 | 989 |
| 13 | 998 |
| 14 | 999 |
| 15 | 6789 |
| 16 | 6798 |
| 17 | 6879 |
| 18 | 6897 |
| 19 | 6978 |
| 20 | 6987 |
| 21 | 7689 |
| 22 | 7698 |
| 23 | 7869 |
| 24 | 7896 |
| 25 | 7899 |
| 26 | 7968 |
| 27 | 7986 |
| 28 | 7989 |
| 29 | 7998 |
| 30 | 8679 |
| 31 | 8697 |
| 32 | 8769 |
| 33 | 8796 |
| 34 | 8799 |
| 35 | 8899 |
| 36 | 8967 |
| 37 | 8976 |
| 38 | 8979 |
| 39 | 8989 |
| 40 | 8997 |
| 41 | 8998 |
| 42 | 8999 |
| 43 | 9678 |
| 44 | 9687 |
| 45 | 9768 |
| 46 | 9786 |
[9,89,98,99,789,798,879,897,899,978,987,989,998, 999,6789,6798,6879,6897,6978,6987,7689,7698,7869, 7896,7899,7968,7986,7989,7998,8679,8697,8769,8796, 8799,8899,8967,8976,8979,8989,8997,8998,8999,9678, 9687,9768,9786] |