T(N) =(N-1)Ck * T(k) * T(N-k-1), where k = number of nodes on left subtree T(1) = 1 T(2) = 1 T(3) = 2 T(4) = 3C2 * T(2) * T(1) = 3 T(5) = 4C3 * T(3) * T(1) = 8 T(6) = 5C3 * T(3) * T(2) = 20 T(7) = 5C3 * T(3) * T(3) = 80