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 | 54 |
| 1 | 21000 |
| 2 | 176033088000 |
| 3 | 34612505928000 |
| 4 | 22228151306961600 |
| 5 | 17861396405584738406400 |
| 6 | 1450791923043620377059840000 |
| 7 | 28748106901407399430780215360000 |