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 | 3 |
| 2 | 11 |
| 3 | 171 |
| 4 | 43691 |
| 5 | 2863311531 |
| 6 | 12297829382473034411 |
| 7 | 226854911280625642308916404954512140971 |
| 8 | 77194726158210796949047323339125271902179989777093709359638389338608753093291 |