Duplicate of A056075.

Terms

a(0) =1a(1) =4a(2) =56a(3) =7192a(4) =7232a(5) =7912a(6) =10792a(7) =17272a(8) =30592a(9) =114256a(10) =2154584a(11) =3428368a(12) =44375136