G.f. A(x) satisfies A(x) = 1 + x * A(x) / A(x^2).

Terms

a(0) =1a(1) =1a(2) =1a(3) =0a(4) =-1a(5) =-2a(6) =-2a(7) =0a(8) =3a(9) =6a(10) =6a(11) =2a(12) =-6a(13) =-14a(14) =-16a(15) =-8a(16) =11a(17) =32a(18) =42a(19) =26a(20) =-18a(21) =-74a(22) =-108a(23) =-82a(24) =18a(25) =162a(26) =268a(27) =238a(28) =16a(29) =-344