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

Terms

a(0) =1a(1) =1a(2) =0a(3) =-3a(4) =-5a(5) =-2a(6) =9a(7) =21a(8) =16a(9) =-23a(10) =-81a(11) =-90a(12) =37a(13) =289a(14) =432a(15) =69a(16) =-941a(17) =-1874a(18) =-1071a(19) =2685a(20) =7504a(21) =6961a(22) =-5913a(23) =-27882a(24) =-35891a(25) =3817a(26) =95472a(27) =163437a(28) =60331a(29) =-294050