a(n) = Sum_{k=0..n}C(n,k)*C(n+k,k)*C(2k,k)*C(2n-2k,n-k)*(-8)^(n-k).

A337332

a(n) = Sum_{k=0..n}C(n,k)*C(n+k,k)*C(2k,k)*C(2n-2k,n-k)*(-8)^(n-k).

Terms

    a(0) =1a(1) =-12a(2) =228a(3) =-3504a(4) =44580a(5) =-298032a(6) =1407504a(7) =-275772096a(8) =21324125988a(9) =-966349948080

External references