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 | 2 |
| 1 | -128 |
| 2 | 253952 |
| 3 | -2863136768 |
| 4 | 107451055603712 |
| 5 | -10140668012798148608 |
| 6 | 2022780765718183801782272 |
| 7 | -757569427466144902069404827648 |