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%I
%S 1,2,12,40,80,224,576,1152,2816,6656,13312,30720,69632,139264,311296,
%T 688128,1376256,3014656,6553600,13107200,28311552,60817408,121634816,
%U 260046848,553648128,1107296256,2348810240,4966055936,9932111872
%N Expansion of (1+8x^2+8x^3)/((1-2x)^2*(1+2x+4x^2)).
%C Hankel transform of A168058 is (-1)^n*a(n).
%H G. C. Greubel, <a href="/A168057/b168057.txt">Table of n, a(n) for n = 0..1000</a>
%H <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (2,0,8,-16).
%F a(n) = 2^n*A168056(n).
%t CoefficientList[Series[(1+8x^2+8x^3)/((1-2x)^2(1+2x+4x^2)), {x,0,50}],x] (* _Harvey P. Dale_, Mar 24 2011 *)
%t LinearRecurrence[{2, 0, 8, -16}, {1, 2, 12, 40}, 50] (* _G. C. Greubel_, Jul 08 2016 *)
%K easy,nonn
%O 0,2
%A _Paul Barry_, Nov 17 2009
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