Expansion of 1/((1-3x)(1-6x)(1-9x)).

Terms

a(0) =1a(1) =18a(2) =225a(3) =2430a(4) =24381a(5) =234738a(6) =2205225a(7) =20404710a(8) =186995061a(9) =1703091258a(10) =15448694625a(11) =139763668590