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 | 8 |
| 5 | 544 |
| 6 | 20976 |
| 7 | 3124800 |
| 8 | 269723136 |
| 9 | 61919980032 |
| 10 | 9210279970560 |
| 11 | 2897383466019840 |