Expansion of (1-3*x+12*x^2)/((1-3*x)*(1+3*x)).

Terms

a(0) =1a(1) =-3a(2) =21a(3) =-27a(4) =189a(5) =-243a(6) =1701a(7) =-2187a(8) =15309a(9) =-19683a(10) =137781a(11) =-177147a(12) =1240029a(13) =-1594323a(14) =11160261a(15) =-14348907a(16) =100442349a(17) =-129140163a(18) =903981141a(19) =-1162261467a(20) =8135830269a(21) =-10460353203a(22) =73222472421a(23) =-94143178827a(24) =659002251789a(25) =-847288609443