G.f.: 1 / (1 + x + Sum_{k>=2} prime(k-1) * x^k).

Terms

a(0) =1a(1) =-1a(2) =-1a(3) =0a(4) =0a(5) =1a(6) =0a(7) =3a(8) =1a(9) =-1a(10) =-4a(11) =-10a(12) =3a(13) =0a(14) =9a(15) =19a(16) =9a(17) =2a(18) =-44a(19) =-27a(20) =-40a(21) =-3a(22) =95a(23) =75a(24) =156a(25) =-36a(26) =-181a(27) =-274a(28) =-349a(29) =81