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 | 2 |
| 1 | 5 |
| 2 | 35 |
| 3 | 1820 |
| 4 | 4967690 |
| 5 | 37016913420305 |
| 6 | 2055377818749516111922729385 |
| 7 | 6336866966711278058881411525857304983854251425952352645 |