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a(n) = Sum_{k=0..floor(n/2)} T(n,k) * T(n,k+1), with T given by A026009.
1

%I #10 Jan 03 2024 06:29:22

%S 1,4,12,46,145,552,1820,6918,23562,89645,312664,1191885,4232345,

%T 16170728,58229100,222997812,811985790,3116622123,11451785640,

%U 44047806725,163072988442,628465576101,2341484487832,9040083756276,33863310322100,130957152428622

%N a(n) = Sum_{k=0..floor(n/2)} T(n,k) * T(n,k+1), with T given by A026009.

%K nonn

%O 0,2

%A _Clark Kimberling_

%E More terms from _Sean A. Irvine_, Oct 26 2019