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a(n) = A027082(n, 2n-7).
0

%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_