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 | 2 |
| 2 | -24 |
| 3 | -624 |
| 4 | -7424 |
| 5 | 242560 |
| 6 | 23499776 |
| 7 | 1002251264 |
| 8 | -2151563264 |
| 9 | -5583112077312 |
| 10 | -666018502836224 |
| 11 | -39230927775531008 |
| 12 | 2301688982196453376 |
| 13 | 1098354240121833783296 |
| 14 | 184678513097428042776576 |