A337268 a(n) = A335703(2n+1).
2, 5, 16, 52, 174, 618, 2300, 8764, 34038, 133858, 530876, 2112904, 8417830, 33592910, 134211556, 536403988, 2144322638
Offset: 0
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.