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 | 0 |
| 1 | 1 |
| 2 | 288 |
| 3 | 125411328000 |
| 4 | 6658606584104736522240000000 |
| 5 | 792786697595796795607377086400871488552960000000000000 |