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 | 13 |
| 2 | 131303 |
| 3 | 13131317 |
| 4 | 131313137 |
| 5 | 13131313133 |
| 6 | 13131313131329 |
| 7 | 131313131313139 |
| 8 | 1313131313131313083 |
| 9 | 13131313131313131331 |
| 10 | 1313131313131313131333 |
| 11 | 131313131313131313131363 |