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 | -2 |
| 2 | -6 |
| 3 | -170 |
| 4 | -9520 |
| 5 | -874902 |
| 6 | -118950678 |
| 7 | -22370367448 |
| 8 | -5550123527520 |