%I #9 Oct 21 2019 02:10:35
%S 1,3,10,30,78,189,480,1242,3030,7084,17112,42146,99792,229065,540544,
%T 1298851,3025386,6871084,15993500,37857267,87275980,196867143,
%U 454118616,1064055225,2435780334,5468505723,12533827796,29153115186
%N a(n) = Sum_{k=0..n} (k+1) * A026681(n, k).
%K nonn
%O 0,2
%A _Clark Kimberling_