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 | 1 |
| 2 | 7 |
| 3 | 139 |
| 4 | 7813 |
| 5 | 1282741 |
| 6 | 626077507 |
| 7 | 914089078999 |
| 8 | 4000061058178633 |
| 9 | 52496811551448519241 |
| 10 | 2066694521388276020211487 |
| 11 | 244076623554395367965602542499 |
| 12 | 86475371441574361841467969073397133 |
| 13 | 91913288701991663661449175594278601481981 |