a(n) = (8^n/n!^2) * Product_{k=0..n-1} (16k+1)*(16k+7).

A184897

a(n) = (8^n/n!^2) * Product_{k=0..n-1} (16k+1)*(16k+7).

Terms

    a(0) =1a(1) =56a(2) =43792a(3) =50098048a(4) =67507119680

External references