A169760 A169759(n)/6.
1, 4, 16, 62, 246, 980, 3912, 15632, 62494, 249904
Offset: 2
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.