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

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =4a(6) =9a(7) =19a(8) =41a(9) =87a(10) =186a(11) =396a(12) =845a(13) =1801a(14) =3841a(15) =8189a(16) =17462a(17) =37232a(18) =79389a(19) =169275a(20) =360937a(21) =769603a(22) =1640982a(23) =3498968a(24) =7460649a(25) =15907905a(26) =33919505a(27) =72324585a(28) =154213514a(29) =328820508