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

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =7a(5) =13a(6) =25a(7) =51a(8) =103a(9) =205a(10) =409a(11) =819a(12) =1639a(13) =3277a(14) =6553a(15) =13107a(16) =26215a(17) =52429a(18) =104857a(19) =209715a(20) =419431a(21) =838861a(22) =1677721a(23) =3355443a(24) =6710887a(25) =13421773a(26) =26843545a(27) =53687091a(28) =107374183a(29) =214748365