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

Terms

a(0) =1a(1) =-1a(2) =4a(3) =-7a(4) =18a(5) =-38a(6) =88a(7) =-195a(8) =441a(9) =-988a(10) =2223a(11) =-4992a(12) =11220a(13) =-25208a(14) =56645a(15) =-127277a(16) =285992a(17) =-642615a(18) =1443946a(19) =-3244514a(20) =7290360a(21) =-16381287a(22) =36808421a(23) =-82707768a(24) =185842671a(25) =-417584688a(26) =938304280a(27) =-2108350576a(28) =4737420745a(29) =-10644887785