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 | 0 |
| 2 | 180 |
| 3 | 5760 |
| 4 | 355860 |
| 5 | 24226560 |
| 6 | 1923670800 |
| 7 | 169658496000 |
| 8 | 16291413249300 |
| 9 | 1674631754611200 |
| 10 | 181989927592033680 |
| 11 | 20709782925396364800 |
| 12 | 2449425950787336166800 |
| 13 | 299337868552812779289600 |
| 14 | 37621311095831818078152000 |