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 | 2 |
| 2 | 22 |
| 3 | 30 |
| 4 | 222 |
| 5 | 230 |
| 6 | 302 |
| 7 | 310 |
| 8 | 320 |
| 9 | 2222 |
| 10 | 2230 |
| 11 | 2302 |
| 12 | 2310 |
| 13 | 2320 |
| 14 | 3022 |
| 15 | 3030 |
| 16 | 3102 |
| 17 | 3110 |
| 18 | 3120 |
| 19 | 3202 |
| 20 | 3210 |
| 21 | 3220 |
| 22 | 3300 |
| 23 | 22222 |
| 24 | 22230 |
| 25 | 22302 |
| 26 | 22310 |
| 27 | 22320 |
| 28 | 23022 |
| 29 | 23030 |
| 30 | 23102 |
| 31 | 23110 |
| 32 | 23120 |
| 33 | 23202 |
| 34 | 23210 |
| 35 | 23220 |
| 36 | 23300 |
| 37 | 30222 |
| 38 | 30230 |
| 39 | 30302 |