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Self-convolution square-root of A117263.
1

%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