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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 7 |
| 5 | 8 |
| 6 | 17 |
| 7 | 18 |
| 8 | 27 |
| 9 | 28 |
| 10 | 37 |
| 11 | 38 |
| 12 | 87 |
| 13 | 88 |
| 14 | 187 |
| 15 | 188 |
| 16 | 287 |
| 17 | 288 |
| 18 | 387 |
| 19 | 388 |
| 20 | 788 |
| 21 | 887 |
| 22 | 888 |
| 23 | 1388 |
| 24 | 1788 |
| 25 | 1887 |
| 26 | 1888 |
| 27 | 2388 |
| 28 | 2788 |
| 29 | 2887 |
| 30 | 2888 |
| 31 | 3388 |
| 32 | 3788 |
| 33 | 3887 |
| 34 | 3888 |
[1,2,3,7,8,17,18,27,28,37,38,87,88,187,188,287, 288,387,388,788,887,888,1388,1788,1887,1888,2388, 2788,2887,2888,3388,3788,3887,3888] |