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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 12 |
| 3 | 100 |
| 4 | 112 |
| 5 | 121 |
| 6 | 122 |
| 7 | 123 |
| 8 | 1012 |
| 9 | 1023 |
| 10 | 1102 |
| 11 | 1122 |
| 12 | 1123 |
| 13 | 1200 |
| 14 | 1201 |
| 15 | 1203 |
| 16 | 1213 |
| 17 | 1222 |
| 18 | 1223 |
| 19 | 1231 |
| 20 | 1232 |
| 21 | 1233 |
| 22 | 1234 |
| 23 | 10000 |
| 24 | 10012 |
| 25 | 10023 |
| 26 | 10102 |
| 27 | 10123 |
| 28 | 10201 |
| 29 | 10202 |
| 30 | 10203 |
| 31 | 10213 |
| 32 | 10223 |
| 33 | 10231 |
| 34 | 10232 |
| 35 | 10234 |
| 36 | 11023 |
| 37 | 11102 |
| 38 | 11200 |
| 39 | 11203 |
| 40 | 11211 |
| 41 | 11213 |
[0,1,12,100,112,121,122,123,1012,1023,1102,1122, 1123,1200,1201,1203,1213,1222,1223,1231,1232,1233, 1234,10000,10012,10023,10102,10123,10201,10202, 10203,10213,10223,10231,10232,10234,11023,11102, 11200,11203,11211,11213] |