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%I #14 Dec 11 2021 04:30:03
%S 0,1,1,2,0,2,2,4,0,3,3,6,0,4,4,8,0,5,5,10,0,6,6,12,0,7,7,14,0,8,8,16,
%T 0,9,9,18,0,10,10,20,0,11,11,22,0,12,12,24,0,13,13,26,0,14,14,28,0,15,
%U 15,30,0,16,16,32
%N Zack's sequence (the pattern is evident).
%H <a href="/index/Rec#order_08">Index entries for linear recurrences with constant coefficients</a>, signature (0,0,0,2,0,0,0,-1).
%F From _R. J. Mathar_, Aug 15 2010: (Start)
%F a(n) = 2*a(n-4) - a(n-8).
%F G.f.: x*(1+x+2*x^2) / ( (x-1)^2*(1+x)^2*(x^2+1)^2 ). (End)
%K nonn,easy
%O 0,4
%A Amela2(AT)aol.com
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