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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 11 |
| 4 | 21 |
| 5 | 22 |
| 6 | 12 |
| 7 | 13 |
| 8 | 23 |
| 9 | 24 |
| 10 | 3 |
| 11 | 25 |
| 12 | 4 |
| 13 | 31 |
| 14 | 26 |
| 15 | 5 |
| 16 | 41 |
| 17 | 27 |
| 18 | 6 |
| 19 | 51 |
| 20 | 28 |
| 21 | 7 |
| 22 | 61 |
| 23 | 29 |
| 24 | 8 |
| 25 | 71 |
| 26 | 211 |
| 27 | 212 |
| 28 | 14 |
| 29 | 32 |
| 30 | 15 |
| 31 | 42 |
| 32 | 16 |
| 33 | 52 |
| 34 | 17 |
| 35 | 62 |
| 36 | 18 |
| 37 | 72 |
| 38 | 19 |
| 39 | 81 |
| 40 | 213 |
| 41 | 214 |
| 42 | 33 |
| 43 | 215 |
| 44 | 43 |
| 45 | 216 |
| 46 | 53 |
| 47 | 217 |
| 48 | 63 |
| 49 | 218 |
| 50 | 73 |
| 51 | 219 |
| 52 | 82 |
| 53 | 111 |
| 54 | 221 |
| 55 | 222 |
| 56 | 112 |
| 57 | 113 |
| 58 | 223 |
| 59 | 224 |
| 60 | 34 |
| 61 | 35 |
| 62 | 44 |
| 63 | 36 |
| 64 | 54 |
[1,2,11,21,22,12,13,23,24,3,25,4,31,26,5,41,27,6, 51,28,7,61,29,8,71,211,212,14,32,15,42,16,52,17, 62,18,72,19,81,213,214,33,215,43,216,53,217,63, 218,73,219,82,111,221,222,112,113,223,224,34,35, 44,36,54] |