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 | 400 |
| 3 | 5760 |
| 4 | 77056 |
| 5 | 989184 |
| 6 | 12390400 |
| 7 | 152862720 |
| 8 | 1867841536 |
| 9 | 22682271744 |
| 10 | 274333696000 |
| 11 | 3309180026880 |
| 12 | 39847582498816 |
| 13 | 479270434504704 |
| 14 | 5760041038643200 |
| 15 | 69190860134154240 |
| 16 | 830853267268304896 |
| 17 | 9974742789667160064 |
| 18 | 119732942204305408000 |