%I
%S 1,6,24,144,541,3258,12275,74280,282003,1713690,6549906,39938616,
%T 153481299,938430990,3622111560,22195961280,85975792075,527816696850
%N a(n) = Sum{T(n,k)*T(n,k+1)}, 0<=k<=n-1, T given by A026374.
%K nonn
%O 1,2
%A _Clark Kimberling_
