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a(n) = Sum_{k=0..n-2} T(n,k) * T(n,k+2), with T given by A026670.
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%I #8 Oct 20 2019 22:02:54

%S 1,8,47,224,1130,4868,23404,97230,457264,1868456,8679894,35162196,

%T 162087345,653396608,2996092939,12041970574,55006554003,220673343660,

%U 1005105011265,4027407386110,18302390130349,73278803406040,332412585527847,1330205838019114,6025308727310905

%N a(n) = Sum_{k=0..n-2} T(n,k) * T(n,k+2), with T given by A026670.

%K nonn

%O 2,2

%A _Clark Kimberling_

%E More terms from _Sean A. Irvine_, Oct 20 2019