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 | -1 |
| 2 | -1 |
| 3 | -43 |
| 4 | -223 |
| 5 | -60623 |
| 6 | -764783 |
| 7 | -107351407 |
| 8 | -2499928867 |
| 9 | -596767688063 |
| 10 | -22200786516383 |
| 11 | -64470807442488761 |
| 12 | -3504534741776035061 |
| 13 | -3597207408242668198973 |
| 14 | -268918457620309807441853 |
| 15 | -185388032403184965693274807 |
| 16 | -18241991360742724891839902347 |