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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 10 |
| 3 | 100 |
| 4 | 101 |
| 5 | 102 |
| 6 | 20 |
| 7 | 120 |
| 8 | 200 |
| 9 | 201 |
| 10 | 202 |
| 11 | 203 |
| 12 | 30 |
| 13 | 103 |
| 14 | 130 |
| 15 | 230 |
| 16 | 300 |
| 17 | 301 |
| 18 | 302 |
| 19 | 303 |
| 20 | 304 |
| 21 | 40 |
| 22 | 104 |
| 23 | 140 |
| 24 | 204 |
| 25 | 240 |
| 26 | 340 |
| 27 | 400 |
| 28 | 401 |
| 29 | 402 |
| 30 | 403 |
| 31 | 404 |
| 32 | 405 |
| 33 | 50 |
| 34 | 105 |
| 35 | 150 |
| 36 | 205 |
| 37 | 250 |
| 38 | 305 |
| 39 | 350 |
| 40 | 450 |
| 41 | 500 |
| 42 | 501 |
| 43 | 502 |
| 44 | 503 |
| 45 | 504 |
| 46 | 505 |
| 47 | 506 |
| 48 | 60 |
| 49 | 106 |
| 50 | 160 |
| 51 | 206 |
| 52 | 260 |
| 53 | 306 |
| 54 | 360 |
[1,10,100,101,102,20,120,200,201,202,203,30,103, 130,230,300,301,302,303,304,40,104,140,204,240, 340,400,401,402,403,404,405,50,105,150,205,250, 305,350,450,500,501,502,503,504,505,506,60,106, 160,206,260,306,360] |