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 | 19 |
| 2 | 191 |
| 3 | 313 |
| 4 | 331 |
| 5 | 911 |
| 6 | 11119 |
| 7 | 111119 |
| 8 | 111191 |
| 9 | 113131 |
| 10 | 131113 |
| 11 | 131311 |
| 12 | 911111 |
| 13 | 1131113 |
| 14 | 1131131 |
| 15 | 1311131 |
| 16 | 1311311 |
| 17 | 3111131 |
| 18 | 3113111 |
| 19 | 11111119 |
| 20 | 11111911 |
| 21 | 11911111 |
| 22 | 111111313 |
| 23 | 111111331 |
| 24 | 111113113 |
| 25 | 111113131 |
| 26 | 111131131 |
| 27 | 111133111 |