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 | 2787593149816327892691964784081045188247557 |
| 3 | 15177100720513508366558296147058741458143803430094840009779784451085189728165691397 |