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 | 2 |
| 4 | 26 |
| 5 | 242 |
| 6 | 2194 |
| 7 | 21304 |
| 8 | 226388 |
| 9 | 2643008 |