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A255575
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a(n) = floor(((sqrt(sqrt(3))^3)/sqrt(Pi))^n).
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1
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1, 1, 1, 2, 2, 3, 4, 5, 7, 9, 12, 15, 20, 26, 33, 43, 56, 72, 92, 119, 153, 197, 253, 325, 419, 539, 693, 891, 1146, 1474, 1896, 2439, 3136, 4034, 5188, 6672, 8581, 11036, 14194, 18254, 23476, 30192, 38830, 49938, 64225, 82598, 106227, 136616, 175698, 225961, 290603, 373737
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OFFSET
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0,4
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COMMENTS
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Inspired by A255405, but starting with a unit circle and an equilateral triangle whose area is equal to Pi.
a(n) is the nested circle curvature (rounded down) after n iterations. See illustration in the links.
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LINKS
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FORMULA
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a(n) = floor(((sqrt(sqrt(3))^3)/sqrt(Pi))^n).
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MAPLE
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MATHEMATICA
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PROG
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(PARI){for(n=0, 100, a=floor(((sqrt(sqrt(3))^3)/sqrt(Pi))^n); print1(a, ", "))}
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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