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 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | -11 |
| 5 | 1 |
| 6 | -1289 |
| 7 | 1644721 |
| 8 | 2705106905705 |
| 9 | 7317603371292879756764065 |
| 10 | 53547319099556919431874542743248407878119975324235 |