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 | 3 |
| 2 | 251 |
| 3 | 59561 |
| 4 | 144115188677547929 |
| 5 | 2535301200456458803003916511253 |
| 6 | 174224571863520493293247799005113585989929 |