Expansion of (4+3*x)/(1+3*x).

Terms

a(0) =4a(1) =-9a(2) =27a(3) =-81a(4) =243a(5) =-729a(6) =2187a(7) =-6561a(8) =19683a(9) =-59049a(10) =177147a(11) =-531441a(12) =1594323a(13) =-4782969a(14) =14348907a(15) =-43046721a(16) =129140163a(17) =-387420489a(18) =1162261467a(19) =-3486784401a(20) =10460353203a(21) =-31381059609a(22) =94143178827a(23) =-282429536481a(24) =847288609443