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 | 4 |
| 2 | 480 |
| 3 | 1488000 |
| 4 | 116064000000 |
| 5 | 226614960000000000 |
| 6 | 11064475422000000000000000 |
| 7 | 13506266841692625000000000000000000 |
| 8 | 412177498341354683437500000000000000000000000 |