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

Terms

a(0) =1a(1) =-1a(2) =2a(3) =-5a(4) =11a(5) =-24a(6) =53a(7) =-117a(8) =258a(9) =-569a(10) =1255a(11) =-2768a(12) =6105a(13) =-13465a(14) =29698a(15) =-65501a(16) =144467a(17) =-318632a(18) =702765a(19) =-1549997a(20) =3418626a(21) =-7540017a(22) =16630031a(23) =-36678688a(24) =80897393a(25) =-178424817a(26) =393528322a(27) =-867954037a(28) =1914332891a(29) =-4222194104