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 | -15 |
| 2 | 255 |
| 3 | -4845 |
| 4 | 101385 |
| 5 | -2309535 |
| 6 | 56759175 |
| 7 | -1494125325 |
| 8 | 41881856625 |
| 9 | -1244022735375 |
| 10 | 38993819043375 |
| 11 | -1285240980610125 |
| 12 | 44407270217165625 |
| 13 | -1604088315616161375 |
| 14 | 60431927134988784375 |
| 15 | -2369411881012489438125 |