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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 11 |
| 3 | 22 |
| 4 | 110 |
| 5 | 121 |
| 6 | 132 |
| 7 | 220 |
| 8 | 231 |
| 9 | 242 |
| 10 | 1100 |
| 11 | 1210 |
| 12 | 1221 |
| 13 | 1232 |
| 14 | 1320 |
| 15 | 1331 |
| 16 | 1342 |
| 17 | 2200 |
| 18 | 2310 |
| 19 | 2321 |
| 20 | 2332 |
| 21 | 2420 |
| 22 | 2431 |
| 23 | 2442 |
| 24 | 11000 |
| 25 | 12100 |
| 26 | 12210 |
| 27 | 12221 |
| 28 | 12232 |
| 29 | 12320 |
| 30 | 12331 |
| 31 | 12342 |
| 32 | 13200 |
| 33 | 13310 |
| 34 | 13321 |
| 35 | 13332 |
| 36 | 13420 |
| 37 | 13431 |
| 38 | 13442 |
| 39 | 22000 |
| 40 | 23100 |
| 41 | 23210 |
| 42 | 23221 |
[0,11,22,110,121,132,220,231,242,1100,1210,1221, 1232,1320,1331,1342,2200,2310,2321,2332,2420,2431, 2442,11000,12100,12210,12221,12232,12320,12331, 12342,13200,13310,13321,13332,13420,13431,13442, 22000,23100,23210,23221] |