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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 11 |
| 3 | 3 |
| 4 | 13 |
| 5 | 113 |
| 6 | 1113 |
| 7 | 11113 |
| 8 | 111113 |
| 9 | 1111113 |
| 10 | 31 |
| 11 | 131 |
| 12 | 33 |
| 13 | 133 |
| 14 | 1133 |
| 15 | 11133 |
| 16 | 111133 |
| 17 | 1111133 |
| 18 | 11111133 |
| 19 | 111111133 |
| 20 | 1111111133 |
| 21 | 11111111133 |
| 22 | 111111111133 |
| 23 | 1111111111133 |
| 24 | 11111111111133 |
| 25 | 111111111111133 |
| 26 | 1111111111111133 |
| 27 | 11111111111111133 |
| 28 | 111111111111111133 |
| 29 | 311 |
| 30 | 1311 |
| 31 | 313 |
| 32 | 1313 |
| 33 | 11313 |
| 34 | 111313 |
| 35 | 1111313 |
| 36 | 11111313 |
| 37 | 331 |
| 38 | 1331 |
| 39 | 333 |
| 40 | 1333 |
| 41 | 11333 |
[1,11,3,13,113,1113,11113,111113,1111113,31,131, 33,133,1133,11133,111133,1111133,11111133, 111111133,1111111133,11111111133,111111111133, 1111111111133,11111111111133,111111111111133, 1111111111111133,11111111111111133, 111111111111111133,311,1311,313,1313,11313,111313, 1111313,11111313,331,1331,333,1333,11333] |