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 | -1 |
| 2 | -16 |
| 3 | -19619 |
| 4 | -4294403215 |
| 5 | -298022109672568357 |
| 6 | -10314423865939993706950978963 |
| 7 | -256923577039780637227768848162543179896514 |
| 8 | -6277101735175091675863380669683250419973895230549186236030 |