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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 5 |
| 6 | 6 |
| 7 | 7 |
| 8 | 8 |
| 9 | 9 |
| 10 | 100 |
| 11 | 102 |
| 12 | 103 |
| 13 | 104 |
| 14 | 105 |
| 15 | 106 |
| 16 | 107 |
| 17 | 108 |
| 18 | 109 |
| 19 | 200 |
| 20 | 201 |
| 21 | 203 |
| 22 | 204 |
| 23 | 205 |
| 24 | 206 |
| 25 | 207 |
| 26 | 208 |
| 27 | 209 |
| 28 | 300 |
| 29 | 301 |
| 30 | 302 |
| 31 | 304 |
| 32 | 305 |
| 33 | 306 |
| 34 | 307 |
| 35 | 308 |
| 36 | 309 |
| 37 | 400 |
| 38 | 401 |
| 39 | 402 |
| 40 | 403 |
| 41 | 405 |
| 42 | 406 |
| 43 | 407 |
| 44 | 408 |
| 45 | 409 |
| 46 | 500 |
| 47 | 501 |
| 48 | 502 |
| 49 | 503 |
| 50 | 504 |
[1,2,3,4,5,6,7,8,9,100,102,103,104,105,106,107, 108,109,200,201,203,204,205,206,207,208,209,300, 301,302,304,305,306,307,308,309,400,401,402,403, 405,406,407,408,409,500,501,502,503,504] |