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

Terms

a(0) =1a(1) =-2a(2) =2a(3) =-4a(4) =8a(5) =-12a(6) =20a(7) =-36a(8) =60a(9) =-100a(10) =172a(11) =-292a(12) =492a(13) =-836a(14) =1420a(15) =-2404a(16) =4076a(17) =-6916a(18) =11724a(19) =-19876a(20) =33708a(21) =-57156a(22) =96908a(23) =-164324a(24) =278636a(25) =-472452a(26) =801100a(27) =-1358372a(28) =2303276a(29) =-3905476