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%I
%S 1,1,1,1,1,2,5,11,21,37,66,127,261,545,1119,2255,4529,9202,18989,
%T 39566,82614,172272,359159,750699,1575649,3319942,7012833,14834345,
%U 31414423,66619692,141526459,301202699,642055773,1370429491,2928418794
%N Expansion of solution of functional equation.
%F G.f. A(x)=y satisfies y=x+(xy)/(1-(xy)^2).
%F Series reversion of g.f. A(x) is -A(-x).
%o (PARI) {a(n)=local(A); if(n<1, 0, A=x+O(x^2); for(k=1,n, A=x+subst(x/(1-x^2),x,x*A)); polcoeff(A,n))}
%K nonn
%O 1,6
%A Michael Somos, Sep 20 2005
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