| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 11 |
| 3 | 12 |
| 4 | 21 |
| 5 | 22 |
| 6 | 31 |
| 7 | 32 |
| 8 | 41 |
| 9 | 42 |
| 10 | 101 |
| 11 | 1001 |
| 12 | 1002 |
| 13 | 1011 |
| 14 | 1012 |
| 15 | 1021 |
| 16 | 1022 |
| 17 | 1031 |
| 18 | 1032 |
| 19 | 10001 |
| 20 | 100001 |
| 21 | 100002 |
| 22 | 100011 |
| 23 | 100012 |
| 24 | 100021 |
| 25 | 100022 |
| 26 | 100031 |
| 27 | 100032 |
| 28 | 1000001 |
| 29 | 10000001 |
| 30 | 10000002 |
| 31 | 10000011 |
| 32 | 10000012 |
| 33 | 10000021 |
| 34 | 10000022 |
[1,2,11,12,21,22,31,32,41,42,101,1001,1002,1011, 1012,1021,1022,1031,1032,10001,100001,100002, 100011,100012,100021,100022,100031,100032,1000001, 10000001,10000002,10000011,10000012,10000021, 10000022] |