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 | 36 |
| 2 | 14400 |
| 3 | 25401600 |
| 4 | 131681894400 |
| 5 | 1593350922240000 |
| 6 | 38775788043632640000 |
| 7 | 1710012252724199424000000 |
| 8 | 126513546505547170185216000000 |
| 9 | 14797530453474819213543604224000000 |