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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 20 |
| 3 | 123 |
| 4 | 1000 |
| 5 | 1331 |
| 6 | 3120 |
| 7 | 11113 |
| 8 | 20000 |
| 9 | 23121 |
| 10 | 33220 |
| 11 | 110303 |
| 12 | 123000 |
| 13 | 202111 |
| 14 | 222320 |
| 15 | 310233 |
| 16 | 1000000 |
| 17 | 1030301 |
| 18 | 1123020 |
| 19 | 1223023 |
| 20 | 1331000 |
| 21 | 2100231 |
| 22 | 2212120 |
| 23 | 2332013 |
| 24 | 3120000 |
| 25 | 3310021 |
| 26 | 10102220 |
| 27 | 10303203 |
| 28 | 11113000 |
| 29 | 11331011 |
| 30 | 12211320 |
[1,20,123,1000,1331,3120,11113,20000,23121,33220, 110303,123000,202111,222320,310233,1000000, 1030301,1123020,1223023,1331000,2100231,2212120, 2332013,3120000,3310021,10102220,10303203, 11113000,11331011,12211320] |