Expansion of (1-x)/(1+4*x^2).

Terms

a(0) =1a(1) =-1a(2) =-4a(3) =4a(4) =16a(5) =-16a(6) =-64a(7) =64a(8) =256a(9) =-256a(10) =-1024a(11) =1024a(12) =4096a(13) =-4096a(14) =-16384a(15) =16384a(16) =65536a(17) =-65536a(18) =-262144a(19) =262144a(20) =1048576a(21) =-1048576a(22) =-4194304a(23) =4194304a(24) =16777216a(25) =-16777216a(26) =-67108864a(27) =67108864a(28) =268435456a(29) =-268435456