Expansion of Sum_{k>0} x^(2*k)/(1+x^k)^6.

Terms

a(0) =0a(1) =1a(2) =-6a(3) =22a(4) =-56a(5) =121a(6) =-252a(7) =484a(8) =-798a(9) =1232a(10) =-2002a(11) =3145a(12) =-4368a(13) =5937a(14) =-8630a(15) =12112a(16) =-15504a(17) =19678a(18) =-26334a(19) =34902a(20) =-42762a(21) =51129a(22) =-65780a(23) =84337a(24) =-98336a(25) =114388a(26) =-143304a(27) =175869a(28) =-201376a(29) =230120