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

%S 1,3,9,30,102,360,1290,4704,17334,64512,241836,912384,3459876,

%T 13178988,50389236,193295652,743610528,2867892588,11085281328,

%U 42933166380,166575534264,647329281456,2519234973996,9817121868084

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

%K nonn

%O 2,2

%A _Clark Kimberling_