%I #5 Jun 27 2013 13:36:02
%S 1,-4,2,4,-8,8,8,-32,16,32,-64,64,64,-256,128,256,-512,512,512,-2048,
%T 1024,2048,-4096,4096,4096,-16384,8192,16384,-32768,32768,32768,
%U -131072,65536,131072,-262144,262144,262144
%N A scaled Hankel transform.
%C A137717=2^floor(n/2)*a(n) is the Hankel transform of A106191.
%F a(n)=A137717(n)/2^floor(n/2).
%F Empirical g.f.: -(4*x^3-4*x^2+4*x-1) / (4*x^4+2*x^2+1). - _Colin Barker_, Jun 27 2013
%Y Cf. A137719.
%K easy,sign
%O 0,2
%A _Paul Barry_, Feb 08 2008
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