a(n) = Product_{1 <= i < j <= n} (prime(i) + prime(j)).

A203521

a(n) = Product_{1 <= i < j <= n} (prime(i) + prime(j)).

Terms

    a(0) =1a(1) =1a(2) =5a(3) =280a(4) =302400a(5) =15850598400

External references