| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 11 |
| 5 | 12 |
| 6 | 21 |
| 7 | 22 |
| 8 | 101 |
| 9 | 102 |
| 10 | 111 |
| 11 | 112 |
| 12 | 121 |
| 13 | 122 |
| 14 | 201 |
| 15 | 202 |
| 16 | 211 |
| 17 | 212 |
| 18 | 221 |
| 19 | 1001 |
| 20 | 1002 |
| 21 | 1011 |
| 22 | 1012 |
| 23 | 1021 |
| 24 | 1022 |
| 25 | 1101 |
| 26 | 1102 |
| 27 | 1111 |
| 28 | 1112 |
| 29 | 1121 |
| 30 | 1201 |
| 31 | 1202 |
| 32 | 1211 |
| 33 | 2001 |
| 34 | 2002 |
| 35 | 2011 |
| 36 | 2012 |
| 37 | 2021 |
| 38 | 2101 |
| 39 | 2102 |
| 40 | 2111 |
| 41 | 2201 |
| 42 | 10001 |
| 43 | 10002 |
| 44 | 10011 |
| 45 | 10012 |
[1,2,3,11,12,21,22,101,102,111,112,121,122,201, 202,211,212,221,1001,1002,1011,1012,1021,1022, 1101,1102,1111,1112,1121,1201,1202,1211,2001,2002, 2011,2012,2021,2101,2102,2111,2201,10001,10002, 10011,10012] |