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 | 1 |
| 1 | 3 |
| 2 | 39 |
| 3 | 9807 |
| 4 | 642665631 |
| 5 | 2760227864398567743 |
| 6 | 50917216999682251351660181504218706559 |
| 7 | 17326231117678921325668214077168498563134593883851671914433735718213795341567 |