a(n) = A203309(n+1)/A203309(n).

A203310

a(n) = A203309(n+1)/A203309(n).

Terms

    a(0) =1a(1) =2a(2) =15a(3) =252a(4) =7560a(5) =356400a(6) =24324300a(7) =2270268000a(8) =277880803200

External references