a(n) = v(n+1)/v(n), where v = A203477.A203478a(n) = v(n+1)/v(n), where v = A203477.Terms a(0) =3a(1) =30a(2) =1080a(3) =146880a(4) =77552640a(5) =161309491200External referencesoeis: A203478