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) |
|---|---|
| 7 | 1 |
| 8 | -58266480 |
| 9 | 3677897920745140 |
| 10 | -230677643550873536294640 |
| 11 | 14475186854407942097510802411322 |
| 12 | -908294062111964496034866469968025332240 |