a(n) = Product_{3 <= p <= 2*n+1, p prime} p^floor(2*n / (p - 1)).

A171080

a(n) = Product_{3 <= p <= 2*n+1, p prime} p^floor(2*n / (p - 1)).

Terms

    a(0) =1a(1) =3a(2) =45a(3) =945a(4) =14175a(5) =467775a(6) =638512875a(7) =1915538625a(8) =488462349375

External references