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a(n) = Sum{T(n,k-1), k = 1,2,...,n}.
0

%I #4 Mar 30 2012 18:56:04

%S 1,3,8,23,67,197,582,1725,5124,15245,45412,135401,404015,1206247,

%T 3603230,10767855,32189931,96259221,287924196,861415809,2577711045,

%U 7714933851,23093949534,69139301043,207017139906,619921659303,1856572250112

%N a(n) = Sum{T(n,k-1), k = 1,2,...,n}.

%K nonn

%O 1,2

%A _Clark Kimberling_