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 | 2 |
| 2 | 11 |
| 3 | 627 |
| 4 | 4087968 |
| 5 | 269232701252579 |
| 6 | 1122762851668802145076610697775 |
| 7 | 7635091408773606342884016584406035907659413687778608637732566 |