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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 5 |
| 6 | 6 |
| 7 | 7 |
| 8 | 8 |
| 9 | 9 |
| 10 | 22 |
| 11 | 36 |
| 12 | 44 |
| 13 | 66 |
| 14 | 88 |
| 15 | 236 |
| 16 | 244 |
| 17 | 333 |
| 18 | 488 |
| 19 | 666 |
| 20 | 999 |
| 21 | 2488 |
| 22 | 2666 |
| 23 | 3366 |
| 24 | 3446 |
| 25 | 4444 |
| 26 | 6999 |
| 27 | 8888 |
| 28 | 26999 |
| 29 | 28888 |
| 30 | 33999 |
| 31 | 34688 |
| 32 | 36666 |
| 33 | 44488 |
| 34 | 44666 |
| 35 | 55555 |
| 36 | 366999 |
| 37 | 368888 |
| 38 | 446999 |
| 39 | 448888 |
| 40 | 466688 |
| 41 | 666666 |
| 42 | 3999999 |
| 43 | 4688999 |
| 44 | 4888888 |
| 45 | 6666999 |
| 46 | 6668888 |
| 47 | 7777777 |
| 48 | 66999999 |
| 49 | 68888999 |
| 50 | 88888888 |
| 51 | 999999999 |
[1,2,3,4,5,6,7,8,9,22,36,44,66,88,236,244,333,488, 666,999,2488,2666,3366,3446,4444,6999,8888,26999, 28888,33999,34688,36666,44488,44666,55555,366999, 368888,446999,448888,466688,666666,3999999, 4688999,4888888,6666999,6668888,7777777,66999999, 68888999,88888888,999999999] |