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 | 10 |
| 2 | 13200 |
| 3 | 2124276000 |
| 4 | 41393302251840000 |
| 5 | 97602635428252959312000000 |
| 6 | 27847155251069188894843979022720000000 |
| 7 | 961359275427083998992553051820498439890246400000000 |