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 | 143665583045350793098657 |
| 2 | 1547374756499590486317191 |
| 3 | 3127894363368981760543181 |
| 4 | 3780564951798029783879299 |