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A092279
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a(n) = floor(7*n/16) + 5.
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1
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5, 5, 5, 6, 6, 7, 7, 8, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 12, 13, 13, 14, 14, 15, 15, 15, 16, 16, 17, 17, 18, 18, 19, 19, 19, 20, 20, 21, 21, 22, 22, 22, 23, 23, 24, 24, 25, 25, 26, 26, 26, 27, 27, 28, 28, 29, 29, 29, 30, 30, 31, 31, 32, 32, 33, 33, 33, 34, 34, 35, 35, 36, 36, 36, 37, 37
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OFFSET
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0,1
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COMMENTS
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Number of vertex guards needed to see both interior and exterior of simple orthogonal polygon with n nodes.
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REFERENCES
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J. O'Rourke, Art Gallery Theorems and Algorithms, Oxford Univ. Press, 1987, p. 157
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LINKS
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FORMULA
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Empirical g.f.: -(4*x^16-x^14-x^12-x^10-x^7-x^5-x^3-5) / (x^17-x^16-x+1). - Colin Barker, Jul 30 2013
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MATHEMATICA
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PROG
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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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