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 | 1 |
| 2 | 21 |
| 3 | 91 |
| 4 | 2211 |
| 5 | 222111 |
| 6 | 22221111 |
| 7 | 229119121 |
| 8 | 291212911 |
| 9 | 2222211111 |
| 10 | 222222111111 |
| 11 | 299992122991 |
| 12 | 1122921211191 |
| 13 | 22222221111111 |
| 14 | 2222222211111111 |
| 15 | 21212929921912191 |
| 16 | 222222222111111111 |
| 17 | 22222222221111111111 |
| 18 | 2222222222211111111111 |
| 19 | 191929912211129991991191 |