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%I #5 May 28 2021 13:47:33
%S 1,3,9,28,87,270,838,2682,8568,27325,87087,284679,928180,3019131,
%T 9813285,32550310,107699892,355521969,1172334682,3930469221,
%U 13143936366,43850286550,146151275976,493751421315,1664336859031,5598215552781,18810575926047
%N a(n) = s(n+3)/3, where s is A024737.
%Y Cf. A024737.
%K nonn
%O 1,2
%A _Clark Kimberling_
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