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%I #8 Oct 27 2019 19:55:11
%S 20,176,1512,12870,109164,924748,7834168,66418402,563744942,
%T 4791449750,40783720460,347663922060,2968147161398,25377794552506,
%U 217294268925008,1863151839105740,15996740130657296,137522838096075630,1183736303278008264,10201145791863572028
%N a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+3), with T given by A026148.
%K nonn
%O 3,1
%A _Clark Kimberling_
%E More terms from _Sean A. Irvine_, Oct 27 2019