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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 10 |
| 4 | 11 |
| 5 | 20 |
| 6 | 21 |
| 7 | 30 |
| 8 | 31 |
| 9 | 40 |
| 10 | 41 |
| 11 | 50 |
| 12 | 51 |
| 13 | 60 |
| 14 | 61 |
| 15 | 70 |
| 16 | 71 |
| 17 | 80 |
| 18 | 81 |
| 19 | 90 |
| 20 | 91 |
| 21 | 100 |
| 22 | 101 |
| 23 | 110 |
| 24 | 111 |
| 25 | 120 |
| 26 | 121 |
| 27 | 130 |
| 28 | 131 |
| 29 | 140 |
| 30 | 141 |
| 31 | 150 |
| 32 | 151 |
| 33 | 160 |
| 34 | 161 |
| 35 | 170 |
| 36 | 171 |
| 37 | 180 |
| 38 | 181 |
| 39 | 190 |
| 40 | 191 |
| 41 | 200 |
| 42 | 201 |
| 43 | 210 |
| 44 | 211 |
| 45 | 220 |
| 46 | 221 |
| 47 | 230 |
| 48 | 231 |
| 49 | 240 |
| 50 | 241 |
| 51 | 250 |
| 52 | 251 |
| 53 | 260 |
| 54 | 261 |
| 55 | 270 |
| 56 | 271 |
[0,1,10,11,20,21,30,31,40,41,50,51,60,61,70,71,80, 81,90,91,100,101,110,111,120,121,130,131,140,141, 150,151,160,161,170,171,180,181,190,191,200,201, 210,211,220,221,230,231,240,241,250,251,260,261, 270,271] |