%I
%S 1,6,24,108,406,1572,5961,22788,87209,335010,1290376,4983162,19286891,
%T 74797176,290586771,1130716508,4406049037,17191077082,67152699384,
%U 262594530318,1027851765350,4026831276662,15788979175102,61954847930374,243278117470476,955907159445522
%N a(n) = Sum_{k=0..n1} T(n,k) * T(n,k+1), with T given by A026626.
%K nonn
%O 1,2
%A _Clark Kimberling_
%E More terms from _Sean A. Irvine_, Oct 20 2019
