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 | 22 |
| 2 | -574 |
| 3 | -59180 |
| 4 | 519916 |
| 5 | 261887912 |
| 6 | 3011178424 |
| 7 | -1596218540048 |
| 8 | -57417595289200 |
| 9 | 12247206626603872 |
| 10 | 816168888129047584 |
| 11 | -111619730570629918912 |
| 12 | -11954207592599713998656 |
| 13 | 1154131532287523742536320 |
| 14 | 189809064938941988673313664 |
| 15 | -12919196827586077923635071232 |