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) |
|---|---|
| 1 | 3 |
| 2 | 5 |
| 3 | 15 |
| 4 | 225 |
| 5 | 50625 |
| 6 | 2562890625 |
| 7 | 6568408355712890625 |
| 8 | 43143988327398919500410556793212890625 |
| 9 | 1861403728794734215467410604755702820123364205073812627233564853668212890625 |