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 | 5 |
| 2 | 23 |
| 3 | 719 |
| 4 | 5039 |
| 5 | 479001599 |
| 6 | 87178291199 |
| 7 | 265252859812191058636308479999999 |
| 8 | 263130836933693530167218012159999999 |
| 9 | 8683317618811886495518194401279999999 |