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

Terms

a(0) =-1a(1) =3a(2) =-12a(3) =20a(4) =-45a(5) =63a(6) =-112a(7) =144a(8) =-225a(9) =275a(10) =-396a(11) =468a(12) =-637a(13) =735a(14) =-960a(15) =1088a(16) =-1377a(17) =1539a(18) =-1900a(19) =2100a(20) =-2541a(21) =2783a(22) =-3312a(23) =3600a(24) =-4225a(25) =4563a(26) =-5292a(27) =5684a(28) =-6525a(29) =6975