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 | 2 |
| 2 | 1373 |
| 3 | 1874177 |
| 4 | 23169162752708970943114627382699355445603465075569066753527132965271355336698663708393617779709970177 |