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) |
|---|---|
| 1 | -3 |
| 2 | -72 |
| 3 | -7560 |
| 4 | -1814400 |
| 5 | -778377600 |
| 6 | -523069747200 |
| 7 | -506854585036800 |
| 8 | -669048052248576000 |
| 9 | -1154107890128793600000 |
| 10 | -2520571632041285222400000 |
| 11 | -6797981691615346244812800000 |