Product_{n>=1} (1 + a(n)*x^n) = 1 + Sum_{n>=1} mu(n)*x^n, where mu = A008683.

Terms

a(0) =1a(1) =-1a(2) =0a(3) =0a(4) =-1a(5) =2a(6) =-4a(7) =5a(8) =-7a(9) =9a(10) =-10a(11) =10a(12) =-5a(13) =4a(14) =19a(15) =-29a(16) =70a(17) =-84a(18) =138a(19) =-121a(20) =174a(21) =-38a(22) =-70a(23) =364a(24) =-797a(25) =1423a(26) =-2048a(27) =3001a(28) =-3479a(29) =3324