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%I #5 Jun 13 2015 00:52:44
%S 1,-4,-28,-56,32,416,832,-256,-4864,-9728,2048,51200,102400,-16384,
%T -507904,-1015808,131072,4849664,9699328,-1048576,-45088768,-90177536,
%U 8388608,411041792,822083584,-67108864,-3690987520,-7381975040
%N Expansion of (1-8x-8x^3)/(1-2x+4x^2)^2.
%C 2*a(n) is the Hankel transform of A066796.
%H <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (4,-12,16,-16).
%F a(n)=2^n*A138341(n);
%K easy,sign
%O 0,2
%A _Paul Barry_, Mar 15 2008
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