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 | 1 |
| 2 | 7 |
| 3 | 139 |
| 4 | 5711 |
| 5 | 408354 |
| 6 | 45605881 |
| 7 | 7390305396 |
| 8 | 1647470410551 |
| 9 | 485292763088275 |
| 10 | 183049273155939442 |
| 11 | 86211400693272461866 |