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%I #9 Oct 26 2019 22:49:27
%S 1,6,21,76,235,738,2177,6424,18423,52590,147917,413796,1147523,
%T 3166842,8689305,23745584,64621199,175277574,473909989,1277864060,
%U 3436938267,9223203858,24699503281,66020102472,176160084775,469293598878
%N a(n) = Sum_{k=0..2n} (k+1) * A026568(n, k).
%F G.f.: (2x^2+4x+1)/(1-x-4x^2)^2.
%K nonn
%O 0,2
%A _Clark Kimberling_
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