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%I #3 Mar 30 2012 18:55:54
%S 6,10,23,63,184,572,1838,6077,20528,70543,245832,866716,3085892,
%T 11079822,40072026,145850388,533831488,1963625766,7255080464,
%U 26912893722,100195188748,374246851254,1402069725352,5267108601573,19836741317924
%N a(n) = [ C(2n,n)/(n-1) ].
%K nonn
%O 2,1
%A _Clark Kimberling_