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 | 124 |
| 2 | -5626 |
| 3 | 715000 |
| 4 | -104379375 |
| 5 | 16966161252 |
| 6 | -2946652593626 |
| 7 | 535467806605000 |
| 8 | -100554207738307500 |
| 9 | 19359037551684042500 |
| 10 | -3800593180746056684372 |
| 11 | 757968936254309704500248 |
| 12 | -153133996443087103652605627 |