Expansion of g.f. (1+x-2*x^2+x^3+x^4)/((1-x)^2*(1+x)^2*(1+2*x)^2).

Terms

a(0) =1a(1) =-3a(2) =8a(3) =-17a(4) =36a(5) =-71a(6) =140a(7) =-269a(8) =516a(9) =-979a(10) =1852a(11) =-3481a(12) =6516a(13) =-12127a(14) =22444a(15) =-41253a(16) =75236a(17) =-135915a(18) =242716a(19) =-427185a(20) =737876a(21) =-1242743a(22) =2019468a(23) =-3106877a(24) =4349636a(25) =-4971011a(26) =2485500a(27) =9942071a(28) =-49710284a(29) =159072881