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 | 8 |
| 3 | -1536 |
| 4 | -14155776 |
| 5 | 10436770529280 |
| 6 | 923378661099307008000 |
| 7 | -13724698564186788948502118400000 |
| 8 | -45695540009113634492156662349750599680000000 |