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a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026780.
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%I #9 Oct 26 2019 15:40:18

%S 1,6,29,156,741,3958,19233,103340,513829,2782642,14111035,76987001,

%T 396866211,2179190558,11387537287,62869497136,332264796115,

%U 1842788400972,9831563838105,54737178645869,294362713929617,1644215891925732,8902034364734719,49863044050919951

%N a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026780.

%K nonn

%O 1,2

%A _Clark Kimberling_

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