G.f. satisfies A(x) = (1 + x*A(x)^2)*(1 + x^2*A(x)^3).

Terms

a(0) =1a(1) =1a(2) =3a(3) =11a(4) =45a(5) =198a(6) =914a(7) =4367a(8) =21414a(9) =107155a(10) =544987a(11) =2808978a(12) =14640073a(13) =77025373a(14) =408544815a(15) =2182206259a(16) =11727989593a(17) =63373962690a(18) =344109933186