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

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =15a(5) =29a(6) =54a(7) =103a(8) =192a(9) =364a(10) =680a(11) =1285a(12) =2405a(13) =4536a(14) =8501a(15) =16014a(16) =30040a(17) =56544a(18) =106135a(19) =199673a(20) =374950a(21) =705155a(22) =1324524a(23) =2490416a(24) =4678728a(25) =8795773a(26) =16526601a(27) =31066048a(28) =58375577a(29) =109724746