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

%I #7 Oct 24 2019 19:14:03

%S 7,43,185,740,2900,11293,43897,170608,663438,2582058,10058862,

%T 39225116,153111686,598228961,2339499161,9157016216,35870666366,

%U 140623656686,551684484386,2165796506636,8507878418516,33441451138598

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

%K nonn

%O 2,1

%A _Clark Kimberling_