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) |
|---|---|
| 0 | 3 |
| 1 | 5 |
| 2 | 21 |
| 3 | 437 |
| 4 | 190965 |
| 5 | 36467631221 |
| 6 | 1329888126870853950837 |
| 7 | 1768602429992068534155014726612412013000565 |