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 | 362880 |
| 1 | 5296790 |
| 2 | 88422296 |
| 3 | 1634227958 |
| 4 | 32096768008 |
| 5 | 649347224736 |