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 | 504 |
| 2 | 16482816 |
| 3 | 34558531338240 |
| 4 | 4638226007491010887680 |
| 5 | 39841906041871272087686291128320 |
| 6 | 21903309038581548352789123727634573903790080 |