Expansion of Sum_{k>=1} k * x^k * (1 - x^k) / (1 + x^k)^3.

Terms

a(0) =1a(1) =-2a(2) =12a(3) =-20a(4) =30a(5) =-24a(6) =56a(7) =-104a(8) =117a(9) =-60a(10) =132a(11) =-240a(12) =182a(13) =-112a(14) =360a(15) =-464a(16) =306a(17) =-234a(18) =380a(19) =-600a(20) =672a(21) =-264a(22) =552a(23) =-1248a(24) =775a(25) =-364a(26) =1080a(27) =-1120a(28) =870a(29) =-720