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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 20160 |
| 7 | 1098377280 |
| 8 | 10712200669548618240 |
| 9 | 157910199555786679826546221836620444160 |
| 10 | 12162675222629942931022379230724715707339402614012620710827200735689241600 |