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 | 432 |
| 3 | 7200 |
| 4 | 118800 |
| 5 | 1995840 |
| 6 | 34594560 |
| 7 | 622702080 |
| 8 | 11675664000 |
| 9 | 228324096000 |
| 10 | 4657811558400 |
| 11 | 99084354969600 |
| 12 | 2196369868492800 |
| 13 | 50685458503680000 |
| 14 | 1216451004088320000 |
| 15 | 30330178368602112000 |