%I #7 Oct 24 2019 19:13:46
%S 9,58,264,1106,4495,18014,71652,283760,1120806,4419928,17413572,
%T 68569666,269941451,1062631046,4183370636,16471711736,64870158866,
%U 255541666976,1006930883396,3968854010936,15648092510618,61714841143568
%N a(n) = A027170(2n, n-2).
%K nonn
%O 2,1
%A _Clark Kimberling_