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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 21 |
| 4 | 2773 |
| 5 | 148365 |
| 6 | 5878391 |
| 7 | 204819447 |
| 8 | 6721694469 |
| 9 | 214306917321 |
| 10 | 6736603947907 |
| 11 | 210284186632443 |
| 12 | 6541309609120385 |
| 13 | 203129541349695597 |
| 14 | 6302428271530970943 |
| 15 | 195459285517696665759 |
| 16 | 6060542952694406463421 |