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 | 10 |
| 2 | -478 |
| 3 | -16340 |
| 4 | 665452 |
| 5 | 44432600 |
| 6 | -1478830280 |
| 7 | -168880559600 |
| 8 | 4294541716880 |
| 9 | 823849124759200 |
| 10 | -14101714763617760 |
| 11 | -4902865088744353600 |
| 12 | 40630051579638182080 |
| 13 | 34412572771327218390400 |
| 14 | 38831520143870883754880 |
| 15 | -278078223664141142377568000 |