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

Terms

a(0) =0a(1) =1a(2) =-1a(3) =3a(4) =4a(5) =12a(6) =21a(7) =34a(8) =56a(9) =75a(10) =115a(11) =141a(12) =204a(13) =238a(14) =329a(15) =372a(16) =496a(17) =549a(18) =711a(19) =775a(20) =980a(21) =1056a(22) =1309a(23) =1398a(24) =1704a(25) =1807a(26) =2171a(27) =2289a(28) =2716a(29) =2850