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 | 1267650600228229401496703205376 |
| 2 | 515377520732011331036461129765621272702107522001 |
| 3 | 7888609052210118054117285652827862296732064351090230047702789306640625 |
| 4 | 3234476509624757991344647769100216810857203198904625400933895331391691459636928060001 |