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) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 2304 |
| 4 | 1194393600 |
| 5 | 1941728542064640000 |
| 6 | 25569049282962188245401600000000 |
| 7 | 5866627428836325123819714259080708096000000000000 |