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 | 7 |
| 3 | 31 |
| 4 | 239 |
| 5 | 1871 |
| 6 | 3299217791 |
| 7 | 101312422979 |
| 8 | 48163250752607 |
| 9 | 3858266531308645633776466396252776719 |
| 10 | 31313481899920920568064578921684656674109265283366018689568994494028479 |