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 | 2 |
| 1 | 16 |
| 2 | 3600 |
| 3 | 4354563600 |
| 4 | 30582275103386435842563600 |
| 5 | 8210597206238423089030527211173884373017314096293353169731842563600 |