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) |
|---|---|
| 8 | 1 |
| 9 | 3 |
| 10 | 15 |
| 11 | 57 |
| 12 | 231 |
| 13 | 853 |
| 14 | 3131 |
| 15 | 11007 |