%I

%S 2,3,34,65,551,1190,8842,20613,141457,347930,2260567,5788458,36110426,

%T 95438348,576758282,1564082093,9212023037,25523422418,147143150689,

%U 415191345278,2350493291126,6737735340308,37550466036439

%N a(n) = 2nd elementary symmetric function of C(n,0), C(n,1), ..., C(n,[ n/2 ]).

%K nonn

%O 2,1

%A _Clark Kimberling_