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 | 2 |
| 2 | 2 |
| 3 | 16 |
| 4 | 98 |
| 5 | 1942 |
| 6 | 54504 |
| 7 | 3375350 |
| 8 | 368335390 |
| 9 | 79138501972 |
| 10 | 31734389399738 |
| 11 | 24359808536352098 |
| 12 | 35370314418915229140 |