%I #4 Mar 30 2012 18:56:14
%S 5,21,176,680,5808,21840,190976,708480,6310400,23220736,209756160,
%T 767676416,7010676736,25558732800,235443322880,855858053120,
%U 7939647995904,28796047982592,268690773770240,972740537352192,9120760620646400
%N a(n) = T(2n,n-2), T given by A027157.
%K nonn
%O 2,1
%A _Clark Kimberling_