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 | -44 |
| 3 | -4940800 |
| 4 | -564083990621761115783168 |
| 5 | -265595429519150677725101890892978815884074732203939261150723571712 |