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 | 2 |
| 2 | -94 |
| 3 | -580 |
| 4 | 26476 |
| 5 | 280312 |
| 6 | -12412616 |
| 7 | -189648688 |
| 8 | 8135757200 |
| 9 | 164956085792 |
| 10 | -6845825678816 |
| 11 | -175348615433792 |
| 12 | 7029102850896064 |
| 13 | 220268177451931520 |
| 14 | -8514540677137722496 |
| 15 | -319237020818325490432 |
| 16 | 11877900753755801088256 |
| 17 | 524319450150645971173888 |