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

Terms

a(0) =0a(1) =0a(2) =1a(3) =2a(4) =4a(5) =12a(6) =22a(7) =64a(8) =126a(9) =340a(10) =714a(11) =1824a(12) =3998a(13) =9868a(14) =22210a(15) =53688a(16) =122790a(17) =293124a(18) =676906a(19) =1603824a(20) =3725198a(21) =8786684a(22) =20479826a(23) =48176168a(24) =112522102a(25) =264267124a(26) =618003194a(27) =1450027488a(28) =3393506014a(29) =7957609580