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 | 28 |
| 3 | 1225 |
| 4 | 16578 |
| 5 | 1479604544 |
| 6 | 1885800643779 |