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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 11 |
| 4 | 12 |
| 5 | 21 |
| 6 | 22 |
| 7 | 28 |
| 8 | 88 |
| 9 | 122 |
| 10 | 221 |
| 11 | 278 |
| 12 | 418 |
| 13 | 421 |
| 14 | 471 |
| 15 | 472 |
| 16 | 478 |
| 17 | 1478 |
| 18 | 1488 |
| 19 | 2778 |
| 20 | 2878 |
| 21 | 4141 |
| 22 | 4271 |
| 23 | 4721 |
| 24 | 8472 |
| 25 | 8878 |
| 26 | 11141 |
| 27 | 14771 |
| 28 | 21171 |
| 29 | 21778 |
| 30 | 27771 |
| 31 | 27878 |
| 32 | 84722 |
| 33 | 88418 |
| 34 | 88471 |
| 35 | 112778 |
| 36 | 112878 |
| 37 | 118818 |
| 38 | 211488 |
| 39 | 272841 |
| 40 | 277818 |
| 41 | 287771 |
| 42 | 414418 |
| 43 | 422222 |
| 44 | 477778 |
| 45 | 878221 |
| 46 | 884428 |
| 47 | 1128222 |
| 48 | 1214171 |
| 49 | 1477221 |
| 50 | 1477421 |
| 51 | 2174278 |
| 52 | 2178818 |
| 53 | 2184441 |
[1,2,11,12,21,22,28,88,122,221,278,418,421,471, 472,478,1478,1488,2778,2878,4141,4271,4721,8472, 8878,11141,14771,21171,21778,27771,27878,84722, 88418,88471,112778,112878,118818,211488,272841, 277818,287771,414418,422222,477778,878221,884428, 1128222,1214171,1477221,1477421,2174278,2178818, 2184441] |