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) |
|---|---|
| 1 | 1 |
| 2 | 0 |
| 3 | -48 |
| 4 | -24 |
| 5 | 1104 |
| 6 | 1128 |
| 7 | -15892 |
| 8 | -25368 |
| 9 | 156240 |
| 10 | 360640 |
| 11 | -1057908 |
| 12 | -3600696 |
| 13 | 4417678 |
| 14 | 26438568 |
| 15 | -3155508 |
| 16 | -144207816 |
| 17 | -112109568 |
| 18 | 564538680 |
| 19 | 1002957320 |
| 20 | -1344487080 |
| 21 | -5096138658 |
| 22 | -111333800 |
| 23 | 17182425012 |
| 24 | 17552839368 |
| 25 | -34668142443 |
| 26 | -86942440944 |
| 27 | 4993723500 |
| 28 | 236551774320 |