Expansion of 1/((1-x)(1-4x)(1-8x)).

Terms

a(0) =1a(1) =13a(2) =125a(3) =1085a(4) =9021a(5) =73533a(6) =593725a(7) =4771645a(8) =38260541a(9) =306433853a(10) =2452868925a(11) =19628543805a(12) =157050720061