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| n | a(n) |
|---|---|
| 0 | 12 |
| 1 | 3456 |
| 2 | 789101112 |
| 3 | 13141516 |
| 4 | 17181920 |
| 5 | 212 |
| 6 | 2232 |
| 7 | 4252 |
| 8 | 6272 |
| 9 | 8 |
| 10 | 29303132 |
| 11 | 33343536 |
| 12 | 37383940 |
| 13 | 41424 |
| 14 | 344 |
| 15 | 45464 |
| 16 | 748 |
| 17 | 49505152 |
| 18 | 53545556 |
| 19 | 57585960 |
| 20 | 616 |
| 21 | 2636 |
| 22 | 4656 |
| 23 | 6676 |
| 24 | 869707172 |
| 25 | 73747576 |
| 26 | 77787980 |
| 27 | 81828 |
| 28 | 384 |
| 29 | 85868 |
| 30 | 788 |
[12,3456,789101112,13141516,17181920,212,2232, 4252,6272,8,29303132,33343536,37383940,41424,344, 45464,748,49505152,53545556,57585960,616,2636, 4656,6676,869707172,73747576,77787980,81828,384, 85868,788] |