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%I #4 Mar 30 2012 18:56:09
%S 1,6,21,108,370,1908,6587,34248,119142,623700,2182818,11487528,
%T 40391988,213451560,753295635,3993910416,14136717574,75152083716,
%U 266650874678,1420670333640,5050926317724,26960309526744,96015725922014
%N a(n) = T(2n,n-1), T given by A026648.
%K nonn
%O 1,2
%A _Clark Kimberling_