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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 100 |
| 6 | 111 |
| 7 | 112 |
| 8 | 113 |
| 9 | 114 |
| 10 | 200 |
| 11 | 211 |
| 12 | 222 |
| 13 | 223 |
| 14 | 224 |
| 15 | 300 |
| 16 | 311 |
| 17 | 322 |
| 18 | 333 |
| 19 | 334 |
| 20 | 400 |
| 21 | 411 |
| 22 | 422 |
| 23 | 433 |
| 24 | 444 |
| 25 | 10000 |
| 26 | 10101 |
| 27 | 10102 |
| 28 | 10103 |
| 29 | 10104 |
| 30 | 11100 |
| 31 | 11111 |
| 32 | 11112 |
| 33 | 11113 |
| 34 | 11114 |
| 35 | 11200 |
| 36 | 11211 |
| 37 | 11222 |
| 38 | 11223 |
| 39 | 11224 |
| 40 | 11300 |
| 41 | 11311 |
| 42 | 11322 |
| 43 | 11333 |
[0,1,2,3,4,100,111,112,113,114,200,211,222,223, 224,300,311,322,333,334,400,411,422,433,444,10000, 10101,10102,10103,10104,11100,11111,11112,11113, 11114,11200,11211,11222,11223,11224,11300,11311, 11322,11333] |