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a(n) = Sum_{k=0..n-3} T(n,k) * T(n,k+3), with T given by A026300.
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%I #9 Oct 18 2019 04:02:47

%S 4,48,469,4222,36715,313912,2661888,22486072,189688752,1600198048,

%T 13510004742,114204762280,966871825132,8199071477920,69645535691958,

%U 592592023212504,5050571335425668,43114956743414712,368632989326212821,3156551837806702698

%N a(n) = Sum_{k=0..n-3} T(n,k) * T(n,k+3), with T given by A026300.

%K nonn

%O 3,1

%A _Clark Kimberling_

%E More terms from _Sean A. Irvine_, Oct 17 2019