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 | -4 |
| 2 | 32 |
| 3 | -832 |
| 4 | 41216 |
| 5 | -3168256 |
| 6 | 359518208 |
| 7 | -56319950848 |
| 8 | 11624409595904 |
| 9 | -3059387770077184 |
| 10 | 999955757611876352 |
| 11 | -397353151288859164672 |
| 12 | 188655750511199441125376 |
| 13 | -105472284295853235792510976 |
| 14 | 68582751548430569936978444288 |
| 15 | -51320267059211655419226235076608 |