| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 10 |
| 4 | 2 |
| 5 | 100 |
| 6 | 11 |
| 7 | 20 |
| 8 | 3 |
| 9 | 1000 |
| 10 | 101 |
| 11 | 110 |
| 12 | 12 |
| 13 | 200 |
| 14 | 21 |
| 15 | 30 |
| 16 | 4 |
| 17 | 10000 |
| 18 | 1001 |
| 19 | 1010 |
| 20 | 102 |
| 21 | 1100 |
| 22 | 111 |
| 23 | 120 |
| 24 | 13 |
| 25 | 2000 |
| 26 | 201 |
| 27 | 210 |
| 28 | 22 |
| 29 | 300 |
| 30 | 31 |
| 31 | 40 |
| 32 | 5 |
| 33 | 100000 |
| 34 | 10001 |
| 35 | 10010 |
| 36 | 1002 |
| 37 | 10100 |
| 38 | 1011 |
| 39 | 1020 |
| 40 | 103 |
| 41 | 11000 |
| 42 | 1101 |
| 43 | 1110 |
| 44 | 112 |
| 45 | 1200 |
| 46 | 121 |
| 47 | 130 |
| 48 | 14 |
| 49 | 20000 |
| 50 | 2001 |
| 51 | 2010 |
[0,1,10,2,100,11,20,3,1000,101,110,12,200,21,30,4, 10000,1001,1010,102,1100,111,120,13,2000,201,210, 22,300,31,40,5,100000,10001,10010,1002,10100,1011, 1020,103,11000,1101,1110,112,1200,121,130,14, 20000,2001,2010] |