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 | -12 |
| 2 | -1368 |
| 3 | -779184 |
| 4 | -260251104 |
| 5 | -120710392488 |
| 6 | -51881715871776 |
| 7 | -24129355507367136 |
| 8 | -11210568318996090624 |
| 9 | -5342692661136883228860 |
| 10 | -2567906908021088206807248 |
| 11 | -1249094126109188331384940944 |
| 12 | -612254304549600491293149962880 |