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) |
|---|---|
| 2 | 2 |
| 3 | 6 |
| 4 | 19 |
| 5 | 82 |
| 6 | 483 |
| 7 | 2728 |
| 8 | 23397 |
| 9 | 174156 |
| 10 | 1851965 |