Expansion of (1-27x^2-108x^3)/((1-3x)^2*(1+3x+9x^2)).

Terms

a(0) =1a(1) =3a(2) =-18a(3) =-135a(4) =-405a(5) =-1944a(6) =-8019a(7) =-24057a(8) =-91854a(9) =-334611a(10) =-1003833a(11) =-3542940a(12) =-12223143a(13) =-36669429a(14) =-124357194a(15) =-416118303a(16) =-1248354909a(17) =-4132485216a(18) =-13559717115a(19) =-40679151345a(20) =-132497807238a(21) =-428874481323