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 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 3 |
| 5 | 19 |
| 6 | 107 |
| 7 | 847 |
| 8 | 8647 |
| 9 | 119835 |
| 10 | 2255123 |
| 11 | 58125783 |
| 12 | 2050662011 |