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

Terms

a(0) =1a(1) =1a(2) =4a(3) =9a(4) =21a(5) =48a(6) =108a(7) =240a(8) =528a(9) =1152a(10) =2496a(11) =5376a(12) =11520a(13) =24576a(14) =52224a(15) =110592a(16) =233472a(17) =491520a(18) =1032192a(19) =2162688a(20) =4521984a(21) =9437184a(22) =19660800a(23) =40894464a(24) =84934656a(25) =176160768a(26) =364904448a(27) =754974720a(28) =1560281088a(29) =3221225472