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

Terms

a(0) =1a(1) =-2a(2) =4a(3) =-7a(4) =13a(5) =-23a(6) =42a(7) =-75a(8) =136a(9) =-244a(10) =441a(11) =-793a(12) =1431a(13) =-2576a(14) =4645a(15) =-8366a(16) =15080a(17) =-27167a(18) =48961a(19) =-88215a(20) =158970a(21) =-286439a(22) =516164a(23) =-930072a(24) =1675961a(25) =-3019941a(26) =5441791a(27) =-9805712a(28) =17669353a(29) =-31838986