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

Terms

a(0) =1a(1) =-3a(2) =11a(3) =-23a(4) =36a(5) =-49a(6) =85a(7) =-143a(8) =176a(9) =-188a(10) =287a(11) =-433a(12) =456a(13) =-479a(14) =726a(15) =-959a(16) =970a(17) =-1024a(18) =1331a(19) =-1748a(20) =1866a(21) =-1741a(22) =2301a(23) =-3153a(24) =2961a(25) =-2824a(26) =3830a(27) =-4559a(28) =4496a(29) =-4514