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) |
|---|---|
| 2 | -1 |
| 3 | -11 |
| 4 | -114 |
| 5 | -3963 |
| 6 | -104745 |
| 7 | -3926745 |
| 8 | -198491580 |
| 9 | -26045435115 |
| 10 | -2153099119815 |
| 11 | -219022225836750 |
| 12 | -26891482281048000 |
| 13 | -3921682257253270125 |
| 14 | -670160622793156369875 |
| 15 | -132649536458654226136125 |