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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 11 |
| 4 | 12 |
| 5 | 21 |
| 6 | 22 |
| 7 | 111 |
| 8 | 112 |
| 9 | 121 |
| 10 | 122 |
| 11 | 211 |
| 12 | 212 |
| 13 | 221 |
| 14 | 222 |
| 15 | 1111 |
| 16 | 1112 |
| 17 | 1121 |
| 18 | 1122 |
| 19 | 1211 |
| 20 | 1212 |
| 21 | 1221 |
| 22 | 1222 |
| 23 | 2111 |
| 24 | 2112 |
| 25 | 2121 |
| 26 | 2122 |
| 27 | 2211 |
| 28 | 2212 |
| 29 | 2221 |
| 30 | 2222 |
| 31 | 11111 |
| 32 | 11112 |
| 33 | 11121 |
| 34 | 11122 |
| 35 | 11211 |
| 36 | 11212 |
| 37 | 11221 |
| 38 | 11222 |
| 39 | 12111 |
| 40 | 12112 |
| 41 | 12121 |
| 42 | 12122 |
[1,2,11,12,21,22,111,112,121,122,211,212,221,222, 1111,1112,1121,1122,1211,1212,1221,1222,2111,2112, 2121,2122,2211,2212,2221,2222,11111,11112,11121, 11122,11211,11212,11221,11222,12111,12112,12121, 12122] |