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 | 3 |
| 1 | 131 |
| 2 | 11311 |
| 3 | 1113111 |
| 4 | 111131111 |
| 5 | 11111311111 |
| 6 | 1111113111111 |
| 7 | 111111131111111 |
| 8 | 11111111311111111 |
| 9 | 1111111113111111111 |
| 10 | 111111111131111111111 |
| 11 | 11111111111311111111111 |
| 12 | 1111111111113111111111111 |
| 13 | 111111111111131111111111111 |
| 14 | 11111111111111311111111111111 |
| 15 | 1111111111111113111111111111111 |