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 | 20 |
| 4 | 21 |
| 5 | 22 |
| 6 | 210 |
| 7 | 211 |
| 8 | 212 |
| 9 | 2100 |
| 10 | 2101 |
| 11 | 2102 |
| 12 | 2120 |
| 13 | 2121 |
| 14 | 2122 |
| 15 | 21010 |
| 16 | 21011 |
| 17 | 21012 |
| 18 | 21200 |
| 19 | 21201 |
| 20 | 21202 |
| 21 | 21220 |
| 22 | 21221 |
| 23 | 21222 |
| 24 | 210110 |
| 25 | 210111 |
| 26 | 210112 |
| 27 | 212000 |
| 28 | 212001 |
| 29 | 212002 |
| 30 | 212020 |
| 31 | 212021 |
| 32 | 212022 |
| 33 | 212210 |
| 34 | 212211 |
| 35 | 212212 |
| 36 | 2101100 |
| 37 | 2101101 |