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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 11 |
| 3 | 20 |
| 4 | 102 |
| 5 | 111 |
| 6 | 120 |
| 7 | 201 |
| 8 | 210 |
| 9 | 300 |
| 10 | 1003 |
| 11 | 1012 |
| 12 | 1021 |
| 13 | 1030 |
| 14 | 1102 |
| 15 | 1111 |
| 16 | 1120 |
| 17 | 1201 |
| 18 | 1210 |
| 19 | 1300 |
| 20 | 2002 |
| 21 | 2011 |
| 22 | 2020 |
| 23 | 2101 |
| 24 | 2110 |
| 25 | 2200 |
| 26 | 3001 |
| 27 | 3010 |
| 28 | 3100 |
| 29 | 4000 |
| 30 | 10004 |
| 31 | 10013 |
| 32 | 10022 |
| 33 | 10031 |
| 34 | 10040 |
| 35 | 10103 |
| 36 | 10112 |
| 37 | 10121 |
| 38 | 10130 |
| 39 | 10202 |
| 40 | 10211 |
[1,11,20,102,111,120,201,210,300,1003,1012,1021, 1030,1102,1111,1120,1201,1210,1300,2002,2011,2020, 2101,2110,2200,3001,3010,3100,4000,10004,10013, 10022,10031,10040,10103,10112,10121,10130,10202, 10211] |