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) |
|---|---|
| 3 | 43252003274489856000 |
| 4 | 1756772880709135843168526079081025059614484630149557651477156021733236798970168550600274887650082354207129600000000000000 |