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 | -552 |
| 2 | 7992 |
| 3 | 460896 |
| 4 | -3450504 |
| 5 | -88161264 |
| 6 | -728085024 |
| 7 | -3775195968 |
| 8 | -14894175240 |
| 9 | -48567693576 |
| 10 | -137214605232 |
| 11 | -347495426784 |
| 12 | -804758753568 |
| 13 | -1733365307184 |
| 14 | -3511286411328 |
| 15 | -6753825302976 |
| 16 | -12422812497672 |
| 17 | -21971174382288 |
| 18 | -37567247938344 |