%I #4 Mar 30 2012 18:56:14
%S 2,7,23,72,218,648,1907,5581,16290,47502,138521,404183,1180402,
%T 3450899,10099605,29589780,86781374,254761882,748580729,2201465799,
%U 6479301022,19083705249,56246157177,165881453558,489506759446
%N T(n,n+1) + T(n,n+2) + ... + T(n,2n), T given by A027113.
%K nonn
%O 0,1
%A _Clark Kimberling_