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 | 1 |
| 1 | 2 |
| 2 | 67634176 |
| 3 | 1775927682136440882473213952 |
| 4 | 22495149450984565292579847926810488282934424886723006835982336 |