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 | -48 |
| 2 | 1728 |
| 3 | -79872 |
| 4 | 4058112 |
| 5 | -216956928 |
| 6 | 11977752576 |
| 7 | -676117610496 |
| 8 | 38792847949824 |
| 9 | -2253773963526144 |
| 10 | 132241430641901568 |
| 11 | -7821943674035503104 |
| 12 | 465750331610495975424 |
| 13 | -27888626411947306254336 |
| 14 | 1677958399935741979262976 |
| 15 | -101375476324084742212288512 |
| 16 | 6146869366762959307806867456 |