This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 210 |
| 4 | 211 |
| 5 | 212 |
| 6 | 21120 |
| 7 | 21121 |
| 8 | 21122 |
| 9 | 21100 |
| 10 | 21101 |
| 11 | 21102 |
| 12 | 2112010 |
| 13 | 2112011 |
| 14 | 2112012 |
| 15 | 2112220 |
| 16 | 2112221 |
| 17 | 2112222 |
| 18 | 2112200 |
| 19 | 2112201 |
| 20 | 2112202 |
| 21 | 2110110 |
| 22 | 2110111 |
| 23 | 2110112 |
| 24 | 211201020 |
| 25 | 211201021 |
| 26 | 211201022 |
| 27 | 211201000 |
| 28 | 211201001 |
| 29 | 211201002 |
| 30 | 211201210 |
| 31 | 211201211 |
| 32 | 211201212 |
| 33 | 211222120 |
| 34 | 211222121 |
| 35 | 211222122 |