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a(n) = A027113(n, 2n-3).
0

%I #7 Oct 23 2019 20:34:42

%S 1,4,13,40,120,352,1022,2948,8473,24304,69649,199544,571795,1639244,

%T 4702499,13500396,38790727,111555296,321100627,925086012,2667533646,

%U 7698716068,22238169212,64289860528,186010834243,538611262492

%N a(n) = A027113(n, 2n-3).

%K nonn

%O 2,2

%A _Clark Kimberling_