a(n) = A356500(2*n+1, 2*n) for n >= 0.

A356505

a(n) = A356500(2*n+1, 2*n) for n >= 0.

Terms

    a(0) =1a(1) =6a(2) =135a(3) =4284a(4) =160965a(5) =6684744a(6) =296679006a(7) =13805453160a(8) =665611197093

External references