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 | -48 |
| 2 | 1200 |
| 3 | -20800 |
| 4 | 280752 |
| 5 | -3142560 |
| 6 | 30338880 |
| 7 | -259459200 |
| 8 | 2003790000 |
| 9 | -14178640368 |
| 10 | 92960115360 |
| 11 | -569803615680 |
| 12 | 3289122824000 |
| 13 | -17987650183200 |
| 14 | 93669997008000 |
| 15 | -466466351287680 |
| 16 | 2229627536828592 |
| 17 | -10261752523778400 |