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 | 56 |
| 2 | 1848 |
| 3 | 47040 |
| 4 | 1023792 |
| 5 | 20076672 |
| 6 | 365787136 |
| 7 | 6314147840 |
| 8 | 104637781248 |
| 9 | 1680323893248 |
| 10 | 26325099300864 |
| 11 | 404403166003200 |
| 12 | 6115019304300544 |
| 13 | 91287994741981184 |
| 14 | 1348582723009708032 |