Expansion of 1/(1 - Sum_{k>=2} mu(k)^2*x^k), where mu(k) is the Moebius function (A008683).

Terms

a(0) =1a(1) =0a(2) =1a(3) =1a(4) =1a(5) =3a(6) =3a(7) =6a(8) =8a(9) =12a(10) =20a(11) =28a(12) =45a(13) =68a(14) =102a(15) =159a(16) =238a(17) =367a(18) =557a(19) =849a(20) =1298a(21) =1973a(22) =3015a(23) =4592a(24) =7002a(25) =10679a(26) =16276a(27) =24822a(28) =37841a(29) =57696