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 | -85 |
| 9 | 14535 |
| 10 | -1652145 |
| 11 | 225683007 |
| 12 | -28005209505 |
| 13 | 3642010817055 |
| 14 | -462535373765985 |
| 15 | 59438516325245343 |
| 16 | -7593183562134412385 |
| 17 | 972884994173649887135 |
| 18 | -124468028808034701006945 |