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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 13 |
| 5 | 13 |
| 6 | 13 |
| 7 | 13 |
| 8 | 23 |
| 9 | 23 |
| 10 | 23 |
| 11 | 23 |
| 12 | 33 |
| 13 | 33 |
| 14 | 33 |
| 15 | 33 |
| 16 | 133 |
| 17 | 133 |
| 18 | 133 |
| 19 | 133 |
| 20 | 133 |
| 21 | 133 |
| 22 | 133 |
| 23 | 133 |
| 24 | 133 |
| 25 | 133 |
| 26 | 133 |
| 27 | 133 |
| 28 | 133 |
| 29 | 133 |
| 30 | 133 |
| 31 | 133 |
| 32 | 233 |
| 33 | 233 |
| 34 | 233 |
| 35 | 233 |
| 36 | 233 |
| 37 | 233 |
| 38 | 233 |
| 39 | 233 |
| 40 | 233 |
| 41 | 233 |
| 42 | 233 |
| 43 | 233 |
| 44 | 233 |
| 45 | 233 |
| 46 | 233 |
| 47 | 233 |
| 48 | 333 |
| 49 | 333 |
| 50 | 333 |
| 51 | 333 |
| 52 | 333 |
| 53 | 333 |
| 54 | 333 |
| 55 | 333 |
[0,1,2,3,13,13,13,13,23,23,23,23,33,33,33,33,133, 133,133,133,133,133,133,133,133,133,133,133,133, 133,133,133,233,233,233,233,233,233,233,233,233, 233,233,233,233,233,233,233,333,333,333,333,333, 333,333,333] |