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 | 2 |
| 1 | 23 |
| 2 | 313 |
| 3 | 3137 |
| 4 | 233347 |
| 5 | 739397 |
| 6 | 379837313 |
| 7 | 73932013313 |
| 8 | 7399973479337 |