a(n) = [x^n] Product_{d|n} 1/(1 + x^d).

Terms

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