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 | 91625794219 |
| 2 | 8796093022207 |
| 3 | 1557609722332488343 |
| 4 | 18216643597893471403 |