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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 10 |
| 6 | 11 |
| 7 | 12 |
| 8 | 13 |
| 9 | 20 |
| 10 | 21 |
| 11 | 22 |
| 12 | 30 |
| 13 | 31 |
| 14 | 100 |
| 15 | 101 |
| 16 | 102 |
| 17 | 103 |
| 18 | 110 |
| 19 | 111 |
| 20 | 112 |
| 21 | 113 |
| 22 | 120 |
| 23 | 121 |
| 24 | 122 |
| 25 | 130 |
| 26 | 200 |
| 27 | 201 |
| 28 | 202 |
| 29 | 210 |
| 30 | 211 |
| 31 | 212 |
| 32 | 220 |
| 33 | 221 |
| 34 | 300 |
| 35 | 301 |
| 36 | 310 |
| 37 | 311 |
| 38 | 1000 |
| 39 | 1001 |
| 40 | 1002 |
| 41 | 1003 |
| 42 | 1010 |
| 43 | 1011 |
| 44 | 1012 |
| 45 | 1013 |
| 46 | 1020 |
| 47 | 1021 |
| 48 | 1022 |
| 49 | 1030 |
| 50 | 1031 |
| 51 | 1100 |
| 52 | 1101 |
| 53 | 1102 |
[0,1,2,3,10,11,12,13,20,21,22,30,31,100,101,102, 103,110,111,112,113,120,121,122,130,200,201,202, 210,211,212,220,221,300,301,310,311,1000,1001, 1002,1003,1010,1011,1012,1013,1020,1021,1022,1030, 1031,1100,1101,1102] |