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 | 5 |
| 2 | 56 |
| 3 | 1080 |
| 4 | 52416 |
| 5 | 2073600 |
| 6 | 168537600 |
| 7 | 9963233280 |
| 8 | 1122750720000 |
| 9 | 234209649623040 |
| 10 | 22056529195008000 |
| 11 | 5634088861040640000 |
| 12 | 1027073825689514803200 |
| 13 | 132063784535221862400000 |
| 14 | 27917533370401003929600000 |