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A235857
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Associated with random Penrose-Robinson tilings of the plane.
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4
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OFFSET
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0,2
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COMMENTS
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LINKS
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MATHEMATICA
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p[n_] := p[n] = 2 p[n-1] q[n-1] - p[n-1]^2 q[n-2];
q[n_] := 2 p[n] q[n-1] - p[n-1] p[n-2] q[n-1] q[n-2]^2;
p[0] = 1; q[0] = 1; p[1] = 2; q[1] = 4;
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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