a(n) = (8^n/n!^2) * Product_{k=0..n-1} (16k+3)*(16k+5).

A184887

a(n) = (8^n/n!^2) * Product_{k=0..n-1} (16k+3)*(16k+5).

Terms

    a(0) =1a(1) =120a(2) =95760a(3) =110230400a(4) =148976385600

External references