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 | -72 |
| 2 | -6048 |
| 3 | -4217184 |
| 4 | -1264437504 |
| 5 | -606533479920 |
| 6 | -251777443450752 |
| 7 | -117085712395216320 |
| 8 | -53634689421870422016 |
| 9 | -25408429618361083967592 |
| 10 | -12110787335129301116994240 |
| 11 | -5854620911089647830793873696 |