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

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =7a(5) =14a(6) =27a(7) =52a(8) =100a(9) =192a(10) =370a(11) =712a(12) =1370a(13) =2638a(14) =5077a(15) =9772a(16) =18809a(17) =36203a(18) =69682a(19) =134122a(20) =258154a(21) =496887a(22) =956393a(23) =1840836a(24) =3543185a(25) =6819813a(26) =13126568a(27) =25265616a(28) =48630484a(29) =93602468