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 | 30 |
| 2 | -782 |
| 3 | -124380 |
| 4 | 214572 |
| 5 | 843265800 |
| 6 | 23493423480 |
| 7 | -7805435749200 |
| 8 | -510774640529520 |
| 9 | 89706704225349600 |
| 10 | 10423307635096361760 |
| 11 | -1196167536017489419200 |
| 12 | -228737063945077567859520 |
| 13 | 17281333628624679401347200 |
| 14 | 5520004649081806480856680320 |