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 | 0 |
| 1 | 2 |
| 2 | 8 |
| 3 | -24 |
| 4 | -4544 |
| 5 | -333920 |
| 6 | -26272896 |
| 7 | -2354853760 |
| 8 | -233143441408 |
| 9 | -22905309777408 |
| 10 | -1339233237800960 |
| 11 | 428177363623094272 |
| 12 | 310125853369485017088 |
| 13 | 153488683972244927062016 |
| 14 | 72759436391841580585680896 |