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) |
|---|---|
| 4 | 1 |
| 5 | 4 |
| 6 | 22 |
| 7 | 126 |
| 8 | 686 |
| 9 | 3640 |
| 10 | 19470 |
| 11 | 103889 |
| 12 | 558389 |
| 13 | 3019000 |
| 14 | 16443467 |