a(n) = Product_{k=0..n-1} (2^(2^k - 1) + 1)^C(n,k).A007184a(n) = Product_{k=0..n-1} (2^(2^k - 1) + 1)^C(n,k).Terms a(0) =1a(1) =2a(2) =18a(3) =39366External referencesoeis: A007184