a(n) = v(n+1)/v(n), where v = A203521.

A203522

a(n) = v(n+1)/v(n), where v = A203521.

Terms

    a(0) =1a(1) =5a(2) =56a(3) =1080a(4) =52416a(5) =2073600a(6) =168537600a(7) =9963233280

External references