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 | -4 |
| 3 | -14 |
| 4 | -4 |
| 5 | 76 |
| 6 | 176 |
| 7 | -104 |
| 8 | -1264 |
| 9 | -1904 |
| 10 | 3776 |
| 11 | 18976 |
| 12 | 15296 |
| 13 | -83264 |
| 14 | -258304 |
| 15 | -17024 |
| 16 | 1515776 |
| 17 | 3133696 |
| 18 | -2827264 |
| 19 | -24456704 |
| 20 | -31949824 |
| 21 | 82840576 |
| 22 | 357380096 |
| 23 | 217716736 |
| 24 | -1708847104 |
| 25 | -4723994624 |
| 26 | 805093376 |