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 | 18 |
| 2 | -254 |
| 3 | -25380 |
| 4 | -16404 |
| 5 | 58383288 |
| 6 | 1098306744 |
| 7 | -182703721392 |
| 8 | -7732416071280 |
| 9 | 705638518433568 |
| 10 | 52925521734602784 |
| 11 | -3125931245323172928 |
| 12 | -392767229604421613376 |
| 13 | 14611648984681938387840 |
| 14 | 3214262644971898893888384 |
| 15 | -60380735974552065344410368 |