%I #4 Mar 30 2012 18:56:54

%S 0,0,2,6,24,84,312,1140,4248,15852,59688,225624,857424,3270216,

%T 12518472,48062520,185034360,714038448,2761343064,10698992304,

%U 41525207448,161418403008,628356425856,2449152822168,9557303840184

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

%K nonn

%O 1,3

%A _Clark Kimberling_