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 | -24 |
| 2 | -1472 |
| 3 | 84480 |
| 4 | 987136 |
| 5 | -196706304 |
| 6 | 2699296768 |
| 7 | 338071388160 |
| 8 | -13641873096704 |
| 9 | -364965248630784 |
| 10 | 36697722069188608 |
| 11 | -133296500464680960 |
| 12 | -71957818786545926144 |
| 13 | 1999978883828768833536 |
| 14 | 99370119662955604738048 |