%I #5 Sep 04 2022 11:07:07
%S 1,1,4,7,10,22,46,88,175,343,820,1693,3448,7399,16807,36322,76609,
%T 166144,378730,831706,1796773,3959785,9004330,20002942,43959124,
%U 97356997,223477834,500128180,1109072953,2483239909,5696350633,12837653710,28703742610
%N a(n) = s(n+3)/3, where s is A024947.
%Y Cf. A024947.
%K nonn
%O 1,3
%A _Clark Kimberling_