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 | 0 |
| 2 | 0 |
| 3 | 8160 |
| 4 | 592110 |
| 5 | 16744320 |
| 6 | -772066560 |
| 7 | -147175522560 |
| 8 | -9650399136480 |
| 9 | -196151407403520 |
| 10 | 28722811654632960 |
| 11 | 3694656375443262240 |
| 12 | 205418279156897590080 |
| 13 | 607856257587978679680 |
| 14 | -1018114883046487751477760 |
| 15 | -102010684902578350260376320 |