%I #7 Oct 23 2019 20:33:19
%S 1,2,3,7,16,39,98,252,659,1747,4682,12662,34505,94644,261069,723707,
%T 2014952,5631875,15796210,44444302,125405217,354765866,1006003375,
%U 2858939669,8141135778,23225997936,66376634429,190000938785
%N a(n) = A027113(n, 2n).
%K nonn
%O 0,2
%A _Clark Kimberling_