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 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 11 |
| 6 | 27 |
| 7 | 82 |
| 8 | 250 |
| 9 | 815 |
| 10 | 2685 |
| 11 | 9072 |
| 12 | 30889 |
| 13 | 106290 |
| 14 | 367733 |
| 15 | 1279573 |
| 16 | 4470304 |
| 17 | 15676760 |
| 18 | 55147665 |