a(n) = n^4*binomial(2*n,n).

Terms

a(0) =0a(1) =2a(2) =96a(3) =1620a(4) =17920a(5) =157500a(6) =1197504a(7) =8240232a(8) =52715520a(9) =318995820a(10) =1847560000a(11) =10328229912a(12) =56073378816a(13) =297051536600