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%I #8 Oct 24 2019 19:13:29
%S 5,21,78,285,1048,3892,14584,55053,209064,797808,3056870,11752676,
%T 45316898,175175818,678639148,2634146413,10241938408,39882831448,
%U 155519160718,607181138848,2373227900938,9285480209458,36364319046898
%N a(n) = (1/2) * A027170(2n, n).
%C A027175(n) + 2.
%K nonn
%O 1,1
%A _Clark Kimberling_