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%I #8 Jun 13 2015 00:51:05
%S 1,4,18,86,418,2022,9650,45334,209730,956870,4312402,19228662,
%T 84948962,372287398,1620178674,7008019670,30150864514,129107299206,
%U 550530654866,2338786731958,9902578218786,41802362561894,175984622563378
%N 2*3^n+2^(2n-1)*(n-2).
%C Binomial transform of A084643. Third binomial transform of abs(A060747).
%H <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (11,-40,48).
%F G.f.: (1-7x+14x^2)/((1-3x)(1-4x)^2).
%K easy,nonn
%O 0,2
%A _Paul Barry_, Jun 09 2003
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