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

Terms

a(0) =1a(1) =0a(2) =0a(3) =2a(4) =2a(5) =2a(6) =6a(7) =10a(8) =14a(9) =26a(10) =46a(11) =74a(12) =126a(13) =218a(14) =366a(15) =618a(16) =1054a(17) =1786a(18) =3022a(19) =5130a(20) =8702a(21) =14746a(22) =25006a(23) =42410a(24) =71902a(25) =121914a(26) =206734a(27) =350538a(28) =594366a(29) =1007834