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Floor(3*n*tau)-Floor(2*n*tau)-Floor(n*tau), where tau=(1+sqrt(5))/2, the golden ratio.
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%I #4 Jun 22 2023 17:11:45

%S 0,0,1,1,0,1,0,1,0,0,1,1,0,0,0,1,0,0,1,1,1,0,0,1,1,0,1,0,1,0,0,1,1,0,

%T 0,0,1,1,0,1,1,1,0,0,1,1,0,0,0,1,0,0,1,1,1,0,0,1,1,0,1,0,1,0,0,1,1,0,

%U 0,0,1,1,0,1,1,1,0,0,1,1,0,1,0,1,0,0,1,1,0,0,0,1,1,0,1,0,1,0,0,1,1,0,0,0,1

%N Floor(3*n*tau)-Floor(2*n*tau)-Floor(n*tau), where tau=(1+sqrt(5))/2, the golden ratio.

%F a(n)=[3*n*tau]-[2*n*tau]-[n*tau], where [ ] denotes the floor function,

%F and tau=(1+sqrt(5))/2.

%Y Cf. A181713, A181714.

%K nonn

%O 1,1

%A _Clark Kimberling_, Nov 07 2010