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) |
|---|---|
| 1 | 2 |
| 2 | 21 |
| 3 | 220 |
| 4 | 2222 |
| 5 | 22211 |
| 6 | 222210 |
| 7 | 2222212 |
| 8 | 22222201 |
| 9 | 222222200 |
| 10 | 2222222202 |
| 11 | 22222222221 |
| 12 | 222222222120 |
| 13 | 2222222222122 |
| 14 | 22222222222111 |
| 15 | 222222222222110 |
| 16 | 2222222222222112 |
| 17 | 22222222222222101 |
| 18 | 222222222222222100 |