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) |
|---|---|
| 3 | 1 |
| 4 | 2 |
| 5 | 3 |
| 6 | 16 |
| 7 | 135 |
| 8 | 3315 |
| 9 | 158817 |
| 10 | 14309547 |
| 11 | 2334512907 |