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 | 1 |
| 2 | 0 |
| 3 | 7 |
| 4 | -7288 |
| 5 | 210319661226 |
| 6 | -28724163065553504725184 |
| 7 | -17273218743083166095017987886925095168489136 |
| 8 | -3262865955763797132157936566332771517266609360571691111615623236765760 |