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 | 1 |
| 2 | 4 |
| 3 | 1485 |
| 4 | 75503872 |
| 5 | 1017252851596875 |
| 6 | 5757133327963849592814528 |
| 7 | 20215881652044379995902152075055222830 |
| 8 | 61135717735233219050448568789931104340315383312314368 |