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 | -2 |
| 3 | -16 |
| 4 | -257 |
| 5 | -6613 |
| 6 | -243980 |
| 7 | -12155224 |
| 8 | -786429623 |
| 9 | -64166829085 |
| 10 | -6449457120962 |
| 11 | -783277824629140 |
| 12 | -113105715390915929 |
| 13 | -19155829563735891169 |
| 14 | -3760880464339217383124 |
| 15 | -847344181950467763488740 |
| 16 | -217159542960607254804746279 |
| 17 | -62816327344923649504400271697 |