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

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =2a(5) =4a(6) =12a(7) =26a(8) =62a(9) =136a(10) =302a(11) =654a(12) =1412a(13) =3018a(14) =6422a(15) =13592a(16) =28662a(17) =60230a(18) =126212a(19) =263810a(20) =550222a(21) =1145352a(22) =2380062a(23) =4938078a(24) =10230852a(25) =21169114a(26) =43749862a(27) =90317816a(28) =186263462a(29) =383769046