a(n) = (2n)!/(a(n-1)*a(n-2)), where a(0)=1, a(1) = 1.

A372991

a(n) = (2n)!/(a(n-1)*a(n-2)), where a(0)=1, a(1) = 1.

Terms

    a(0) =1a(1) =1a(2) =24a(3) =30a(4) =56a(5) =2160a(6) =3960a(7) =10192a(8) =518400a(9) =1211760a(10) =3872960a(11) =239500800a(12) =668891520a(13) =2517424000a(14) =181062604800a(15) =581935622400

External references