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) |
|---|---|
| 2 | 2544221971606336 |
| 3 | 10205276352438060 |
| 4 | 2034000581064892726 |
| 5 | 10716579270481431300 |