G.f.: Sum_{n>=0} x^n/(1 + x^n)^n.

Terms

a(0) =1a(1) =1a(2) =0a(3) =2a(4) =-2a(5) =2a(6) =0a(7) =2a(8) =-8a(9) =8a(10) =0a(11) =2a(12) =-12a(13) =2a(14) =0a(15) =32a(16) =-36a(17) =2a(18) =0a(19) =2a(20) =-20a(21) =58a(22) =0a(23) =2a(24) =-136a(25) =72a(26) =0a(27) =92a(28) =-28a(29) =2