Binomial coefficient C(4n,n-8).

Terms

a(0) =1a(1) =36a(2) =780a(3) =13244a(4) =194580a(5) =2598960a(6) =32468436a(7) =386206920a(8) =4426165368a(9) =49280065120a(10) =536211932256