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%I A291526 #9 Sep 01 2017 14:10:39
%S A291526 0,0,4,20,68,196,516,1284,3076,7172,16388,36868,81924,180228,393220,
%T A291526 851972,1835012,3932164,8388612,17825796,37748740,79691780,167772164,
%U A291526 352321540,738197508,1543503876,3221225476,6710886404,13958643716,28991029252,60129542148
%N A291526 a(n) = 2^n*(n - 3) + 4.
%C A291526 Also the skewness of the (n+1)-hypercube graph.
%H A291526 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/GraphSkewness.html">Graph Skewness</a>
%H A291526 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/HypercubeGraph.html">Hypercube Graph</a>
%H A291526 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (5, -8, 4).
%F A291526 G.f.: 4*x^3/((1 - 2*x)^2*(1 - x)).
%F A291526 a(n) = 5*a(n-1) - 8*a(n-2) + 4*a(n-3).
%F A291526 a(n) = 4*A000337(n-2), with A000337(-1) = 0.
%t A291526 Table[2^n (n - 3) + 4, {n, 20}]
%t A291526 LinearRecurrence[{5, -8, 4}, {0, 0, 4}, 20]
%t A291526 CoefficientList[Series[4 x^3/((1 - 2 x)^2 (1 - x)), {x, 0, 20}], x]
%Y A291526 Cf. A000337.
%K A291526 nonn,easy
%O A291526 1,3
%A A291526 _Eric W. Weisstein_, Aug 25 2017

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