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%I #16 Oct 12 2016 09:56:19
%S 1,-2,-3,-8,-28,-112,-484,-2200,-10364,-50144,-247684,-1243816,
%T -6331164,-32591184,-169376484,-887465784,-4682990076,-24864759744,
%U -132745182724,-712136879944,-3837043171100,-20755343638064,-112668274522852,-613581530620888,-3351355226348668,-18354390999804832,-100771410237846404,-554536090460808680
%N G.f.: ((1-q)^2+(1+q)*sqrt(1-6*q+q^2))/2.
%H Harris Kwong, <a href="http://www.fq.math.ca/Papers1/48-4/Kwong.pdf">On recurrences of Fahr and Ringel: an alternate approach</a>, Fibonacci Quart. 48 (2010), no. 4, 363-365; see p. 364.
%t CoefficientList[Series[((1 - x)^2 + (1 + x) Sqrt[1 - 6 x + x^2])/2, {x, 0, 27}], x] (* _Michael De Vlieger_, Oct 12 2016 *)
%Y Cf. A010683 (a closely-related g.f.)
%K sign
%O 0,2
%A _N. J. A. Sloane_, Dec 08 2010
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