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%I #19 Feb 26 2020 21:29:45
%S 0,10,0,10,0,10,0,10,0,10,0,10,0,10,0,10,0,10,0,10,0,10,0,10,0,10,0,
%T 10,0,10,0,10,0,10,0,10,0,10,0,10,0,10,0,10,0,10,0,10,0,10,0,10,0,10,
%U 0,10,0,10,0,10,0,10,0,10,0,10
%N Period 2: repeat (0,10).
%H <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (0,1).
%F a(n) = 5*[1-(-1)^n] = 10*(n mod 2). - _Paolo P. Lava_, Oct 20 2006
%F G.f.: 10x/((1-x)(1+x)). - _R. J. Mathar_, Nov 21 2011
%t PadRight[{},120,{0,10}] (* _Harvey P. Dale_, Jan 15 2016 *)
%o (PARI) a(n)=n%2*10 \\ _Charles R Greathouse IV_, Jul 13 2016
%K nonn,easy
%O 0,2
%A _N. J. A. Sloane_
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