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) |
|---|---|
| 2 | 1 |
| 3 | -107 |
| 4 | 59845 |
| 5 | -6059823 |
| 6 | 5508149745 |
| 7 | -8781562891079 |
| 8 | 1498497874868995 |
| 9 | -11547310445901623393 |
| 10 | 191303386010904797215729 |
| 11 | -346881088942362502864933961 |
| 12 | 3531597876908273097022040806863 |