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 | 0 |
| 4 | 1 |
| 5 | 3 |
| 6 | 15 |
| 7 | 59 |
| 8 | 296 |
| 9 | 1604 |
| 10 | 11303 |
| 11 | 102108 |
| 12 | 1250114 |
| 13 | 20738069 |
| 14 | 467523871 |
| 15 | 14230096759 |
| 16 | 581439661069 |
| 17 | 31720637440030 |