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a(n) = A027170(2n, n-1).
0

%I #7 Oct 24 2019 19:13:37

%S 5,30,123,472,1790,6794,25879,98952,379674,1461248,5638930,21811540,

%T 84542016,328287506,1276868111,4973645576,19398954626,75753497816,

%U 296142817406,1158865623236,4539024407576,17793358627976,69805770185498

%N a(n) = A027170(2n, n-1).

%K nonn

%O 1,1

%A _Clark Kimberling_