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 | 1 |
| 3 | 2 |
| 4 | 8 |
| 5 | 32 |
| 6 | 139 |
| 7 | 618 |
| 8 | 2779 |
| 9 | 12528 |
| 10 | 56404 |
| 11 | 253152 |
| 12 | 1131849 |
| 13 | 5040412 |
| 14 | 22359981 |
| 15 | 98837102 |