Expansion of x^4*(2-7*x+6*x^2+x^3-x^4)/((1-x)*(1-2*x)^4*(1-3*x+x^2)).

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =2a(5) =17a(6) =90a(7) =383a(8) =1436a(9) =4958a(10) =16159a(11) =50480a(12) =152690a(13) =450343a(14) =1301764a(15) =3701990a(16) =10387887a(17) =28827688a(18) =79265482a(19) =216271927a(20) =586261980a(21) =1580524894a(22) =4241295935a(23) =11336890720a(24) =30202962402a(25) =80239307847a(26) =212664541940a(27) =562513804438