Expansion of ((1+x)^4-(1+x)x^3)/((1+x)^5-x^5).

Terms

a(0) =1a(1) =-1a(2) =1a(3) =-2a(4) =5a(5) =-10a(6) =15a(7) =-15a(8) =0a(9) =50a(10) =-175a(11) =450a(12) =-1000a(13) =2000a(14) =-3625a(15) =5875a(16) =-8125a(17) =8125a(18) =0a(19) =-29375a(20) =106250a(21) =-278125a(22) =621875a(23) =-1243750a(24) =2250000a(25) =-3640625a(26) =5031250a(27) =-5031250a(28) =0a(29) =18203125