%I #7 Oct 23 2019 20:33:29
%S 1,4,9,23,59,154,407,1088,2935,7980,21843,60139,166425,462638,1291245,
%T 3616923,10164335,28648092,80960915,229360649,651237509,1852936294,
%U 5282196109,15084862158,43150636493,123624304356,354689105733
%N a(n) = A027113(n, 2n-1).
%K nonn
%O 1,2
%A _Clark Kimberling_