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 | -1 |
| 3 | -8 |
| 4 | 1296 |
| 5 | 7962624 |
| 6 | -2985984000000 |
| 7 | -100306130042880000000 |
| 8 | 416336312719673760153600000000 |
| 9 | 281633758444745849464726940024832000000000 |