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 | 1 |
| 2 | 4 |
| 3 | 16 |
| 4 | 72 |
| 5 | 364 |
| 6 | 1916 |
| 7 | 10581 |
| 8 | 59681 |
| 9 | 343903 |
| 10 | 2010089 |