v(n)/A000178(n); v=A203518 and A000178=(superfactorials).

A203520

v(n)/A000178(n); v=A203518 and A000178=(superfactorials).

Terms

    a(0) =1a(1) =3a(2) =30a(3) =1680a(4) =900900a(5) =9535125600

External references