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 | -16 |
| 3 | 8 |
| 4 | 12672 |
| 5 | 571264 |
| 6 | -44351360 |
| 7 | -12355211520 |
| 8 | -452681248768 |
| 9 | 478190483394560 |
| 10 | 132554796040912896 |
| 11 | -18854516962334277632 |
| 12 | -27186884683859043123200 |
| 13 | -5502410397289951851773952 |
| 14 | 6273206188133923322747420672 |
| 15 | 5389680791235134726930445369344 |