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%I #3 Mar 30 2012 18:36:56
%S 1,1,3,29,831,69107,16944055,12387543565,27116679815367,
%T 177967005474840987,3503280999913078429261,
%U 206872249547698485286567247,36647212198301159763279385189667
%N Self-convolution square-root of A117263.
%o (PARI) {a(n)=local(A2=vector(n+1,m,sum(k=0,m-1,3^((m-k-1)*(m+k-2)/2))));Vec(Ser(A2)^(1/2))[n+1]}
%K nonn
%O 0,3
%A _Paul D. Hanna_, Mar 14 2006