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 | -5 |
| 2 | 73 |
| 3 | -2765 |
| 4 | 171409 |
| 5 | -16145045 |
| 6 | 2168436697 |
| 7 | -391723265885 |
| 8 | 91633164775201 |
| 9 | -26955095234906405 |
| 10 | 9737498127795037033 |
| 11 | -4237907290209405609965 |
| 12 | 2187044171819241257792689 |
| 13 | -1320533769141977996485790645 |
| 14 | 922274662722967857470247551737 |
| 15 | -737730926392606318468533810754685 |