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 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 4 |
| 5 | 9 |
| 6 | 196 |
| 7 | 16641 |
| 8 | 639988804 |
| 9 | 177227652025317609 |
| 10 | 72589906463585427805281295977816196 |
| 11 | 2280022876287160141646375873338796324543839666085098409289740769448641 |