Expansion of Sum_{k>0} x^(3*k)/(1+x^k)^3.

Terms

a(0) =0a(1) =0a(2) =1a(3) =-3a(4) =6a(5) =-9a(6) =15a(7) =-24a(8) =29a(9) =-30a(10) =45a(11) =-67a(12) =66a(13) =-63a(14) =98a(15) =-129a(16) =120a(17) =-117a(18) =153a(19) =-204a(20) =206a(21) =-165a(22) =231a(23) =-341a(24) =282a(25) =-234a(26) =354a(27) =-417a(28) =378a(29) =-354