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 | 1 |
| 3 | 1 |
| 4 | 576 |
| 5 | 207360000 |
| 6 | 26956124946896309452800000000000 |
| 7 | 2841003716170671644367609186370356458508919205193278721884160000000000000000000000 |