G.f. A(x) satisfies A(x)^2 = A(x^2) + 2*A(x^3).

Terms

a(0) =1a(1) =1a(2) =0a(3) =0a(4) =1a(5) =-1a(6) =1a(7) =-1a(8) =1a(9) =0a(10) =-2a(11) =4a(12) =-6a(13) =9a(14) =-9a(15) =4a(16) =7a(17) =-28a(18) =58a(19) =-89a(20) =107a(21) =-86a(22) =-13a(23) =233a(24) =-597a(25) =1064a(26) =-1483a(27) =1540a(28) =-701a(29) =-1725