Expansion of Sum_{k>0} x^(4*k)/(1+x^k)^4.

Terms

a(0) =0a(1) =0a(2) =0a(3) =1a(4) =-4a(5) =10a(6) =-20a(7) =36a(8) =-56a(9) =80a(10) =-120a(11) =176a(12) =-220a(13) =266a(14) =-368a(15) =491a(16) =-560a(17) =634a(18) =-816a(19) =1050a(20) =-1160a(21) =1210a(22) =-1540a(23) =1982a(24) =-2028a(25) =2080a(26) =-2656a(27) =3192a(28) =-3276a(29) =3380