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) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 1 |
| 9 | 362880 |
| 10 | 1371785398200 |
| 11 | 7673688777463632000 |
| 12 | 65599839591251908982712750 |
| 13 | 885282776210120715086715619724160 |
| 14 | 19040419266278799766631032461849139013040 |