Expansion of (1 - x)/(1 - 2*x - 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