A045872 a(n) = A006792(n)/2.
1, 0, 0, 0, 0, 2, 4, 0, 2, 0, 41, 0, 0, 0, 56, 0, 66, 0
Offset: 10
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.