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

Terms

a(0) =1a(1) =3a(2) =6a(3) =9a(4) =10a(5) =6a(6) =-6a(7) =-27a(8) =-53a(9) =-72a(10) =-63a(11) =0a(12) =136a(13) =336a(14) =537a(15) =603a(16) =334a(17) =-471a(18) =-1878a(19) =-3618a(20) =-4886a(21) =-4275a(22) =-45a(23) =9072a(24) =22465a(25) =35904a(26) =40272a(27) =22176a(28) =-31823a(29) =-126093