%I #4 Mar 30 2012 18:56:09
%S 1,2,4,10,20,42,84,196,392,842,1684,3878,7756,16786,33572,76846,
%T 153692,333998,667996,1523448,3046896,6639150,13278300,30206468,
%U 60412936,131892226,263784452,598952096,1197904192,2619074230
%N T(n,0) + T(n,1) + ... + T(n,n), T given by A026659.
%K nonn
%O 0,2
%A _Clark Kimberling_