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 | 1 |
| 4 | 1 |
| 5 | 7 |
| 6 | 30 |
| 7 | 141 |
| 8 | 668 |
| 9 | 3249 |
| 10 | 15666 |
| 11 | 75931 |
| 12 | 367664 |
| 13 | 1781841 |
| 14 | 8636667 |
| 15 | 41888162 |