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 | 1 |
| 2 | 2 |
| 3 | 9 |
| 4 | 57 |
| 5 | 460 |
| 6 | 4641 |
| 7 | 50353 |
| 8 | 575375 |
| 9 | 6754382 |
| 10 | 80887484 |
| 11 | 982952256 |
| 12 | 12087512169 |