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

Terms

a(0) =0a(1) =1a(2) =2a(3) =8a(4) =20a(5) =44a(6) =92a(7) =188a(8) =380a(9) =764a(10) =1532a(11) =3068a(12) =6140a(13) =12284a(14) =24572a(15) =49148a(16) =98300a(17) =196604a(18) =393212a(19) =786428a(20) =1572860a(21) =3145724a(22) =6291452a(23) =12582908a(24) =25165820a(25) =50331644a(26) =100663292a(27) =201326588a(28) =402653180a(29) =805306364