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) |
|---|---|
| 0 | 1 |
| 1 | -6 |
| 2 | -702 |
| 3 | -393804 |
| 4 | -132734778 |
| 5 | -61428055320 |
| 6 | -26480146877172 |
| 7 | -12318952616296752 |
| 8 | -5730786812846192490 |
| 9 | -2732960583228848850522 |
| 10 | -1314627022075990658598360 |
| 11 | -639871947654492158944455132 |
| 12 | -313833506047227501170833823292 |