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a(n)=(1/2)*T(2n,n), where T is given by A048113.
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%I #4 Mar 30 2012 18:56:54

%S 1,2,6,18,60,204,720,2580,9408,34668,129024,483672,1824768,6919752,

%T 26357976,100778472,386591304,1487221056,5735785176,22170562656,

%U 85866332760,333151068528,1294658562912,5038469947992,19634243736168

%N a(n)=(1/2)*T(2n,n), where T is given by A048113.

%K nonn

%O 2,2

%A _Clark Kimberling_