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 | 1 |
| 2 | 6 |
| 3 | 10080 |
| 4 | 36324288000 |
| 5 | 1077167364120207360000 |
| 6 | 717579719887926731226850787328000000 |
| 7 | 23946596436219275985459662514223331478629410406400000000 |