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 | 1113 |
| 2 | 1131 |
| 3 | 1311 |
| 4 | 3111 |
| 5 | 13111 |
| 6 | 31111 |
| 7 | 111113 |
| 8 | 111131 |
| 9 | 111311 |
| 10 | 1111113 |
| 11 | 1111131 |
| 12 | 1111311 |
| 13 | 1113111 |
| 14 | 1131111 |
| 15 | 1311111 |
| 16 | 3111111 |
| 17 | 11111113 |
| 18 | 11311111 |
| 19 | 13111111 |
| 20 | 31111111 |
| 21 | 111111311 |
| 22 | 111131111 |
| 23 | 111311111 |
| 24 | 113111111 |
| 25 | 311111111 |
| 26 | 1111111113 |
| 27 | 1111111131 |
| 28 | 1111111311 |