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 | 13 |
| 1 | 131 |
| 2 | 1319 |
| 3 | 131909 |
| 4 | 13190909 |
| 5 | 1319090933 |
| 6 | 131909093341 |
| 7 | 13190909334101 |
| 8 | 1319090933410141 |
| 9 | 131909093341014131 |
| 10 | 13190909334101413129 |
| 11 | 131909093341014131297 |
| 12 | 13190909334101413129739 |