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 | 5 |
| 2 | 61 |
| 3 | 277 |
| 4 | 23489580527043108252017828576198947741 |
| 5 | 5516994249383296071214195242422482492286460673697 |