A096407 a(n) = f(n)/f(n-2) where f(k) = A002665(k).
5, 17, 197, 33857, 1133938277, 1285739650972396817, 1653126447166808571538254964938621797
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.