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 | 0 |
| 2 | 0 |
| 3 | 2184 |
| 4 | 44226 |
| 5 | 530712 |
| 6 | -22289904 |
| 7 | -1041080040 |
| 8 | -23414482728 |
| 9 | 86664734520 |
| 10 | 22704271546320 |
| 11 | 824932708688088 |
| 12 | 10338270616438674 |
| 13 | -363177176817506688 |
| 14 | -24534229526034608016 |
| 15 | -614775613733783853624 |
| 16 | -526997882017733986314 |
| 17 | 591470477348411755418688 |
| 18 | 24257417213770154760619728 |
| 19 | 384176112414487265101313448 |