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 | 0 |
| 2 | 1 |
| 3 | 12 |
| 4 | 304 |
| 5 | 12696 |
| 6 | 778785 |
| 7 | 64118596 |
| 8 | 7014698888 |
| 9 | 965862895732 |
| 10 | 166105870928994 |
| 11 | 34460169208369298 |