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) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 355 |
| 3 | 94852805 |
| 4 | 1709678476417571835487555 |
| 5 | 9994796326591347130392203807311551183419838794447313956622219314498503205 |