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 | 202 |
| 2 | 22022 |
| 3 | 2220222 |
| 4 | 222202222 |
| 5 | 22222022222 |
| 6 | 2222220222222 |
| 7 | 222222202222222 |
| 8 | 22222222022222222 |
| 9 | 2222222220222222222 |
| 10 | 222222222202222222222 |
| 11 | 22222222222022222222222 |
| 12 | 2222222222220222222222222 |
| 13 | 222222222222202222222222222 |
| 14 | 22222222222222022222222222222 |
| 15 | 2222222222222220222222222222222 |