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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 13 |
| 3 | 102 |
| 4 | 224 |
| 5 | 1000 |
| 6 | 1331 |
| 7 | 2333 |
| 8 | 4022 |
| 9 | 10404 |
| 10 | 13000 |
| 11 | 20311 |
| 12 | 23403 |
| 13 | 32242 |
| 14 | 41434 |
| 15 | 102000 |
| 16 | 112341 |
| 17 | 124123 |
| 18 | 141312 |
| 19 | 204414 |
| 20 | 224000 |
| 21 | 244021 |
| 22 | 320043 |
| 23 | 342132 |
| 24 | 420244 |
| 25 | 1000000 |
| 26 | 1030301 |
| 27 | 1112213 |
| 28 | 1200302 |
| 29 | 1240024 |
| 30 | 1331000 |
| 31 | 1423131 |
| 32 | 2022033 |
| 33 | 2122222 |
| 34 | 2224204 |
[1,13,102,224,1000,1331,2333,4022,10404,13000, 20311,23403,32242,41434,102000,112341,124123, 141312,204414,224000,244021,320043,342132,420244, 1000000,1030301,1112213,1200302,1240024,1331000, 1423131,2022033,2122222,2224204] |