%I #7 Oct 23 2019 17:32:45
%S 1,3,9,31,105,352,1168,3828,12396,39698,125878,395686,1234426,3825911,
%T 11790893,36160491,110429221,336001043,1019092233,3082348295,
%U 9300339633,28002492673,84156758459,252507279805,756547966323
%N a(n) = A027082(n, 2n-7).
%K nonn
%O 4,2
%A _Clark Kimberling_