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A067154
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Number of regions in regular n-gon which are 7-gons.
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9
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1, 0, 0, 0, 0, 0, 0, 0, 15, 0, 17, 18, 57, 0, 21, 44, 115, 0, 150, 104, 81, 112, 116, 0, 155, 224, 429, 306, 560, 180, 555, 836, 663, 640, 1025, 378, 1419, 660, 1710, 1564, 1786, 1200, 2352, 1050, 2754, 2236, 2597, 2700, 3410, 2240, 3078, 3190, 4602, 1860, 5551
(list; graph; refs; listen; history; internal format)
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OFFSET
| 7,9
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REFERENCES
| B. Poonen and M. Rubinstein, Number of Intersection Points Made by the Diagonals of a Regular Polygon, SIAM J. Discrete Mathematics, Vol. 11, pp. 135-156.
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LINKS
| Sascha Kurz, m-gons in regular n-gons
B. Poonen and M. Rubinstein, The number of intersection points made by the diagonals of a regular polygon, SIAM J. on Discrete Mathematics, Vol. 11, No. 1, 135-156 (1998).
Sequences formed by drawing all diagonals in regular polygon
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EXAMPLE
| a(7)=1 because the center-region is a 7-gon.
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CROSSREFS
| Cf. A007678, A067166, A064869, A067151, A067152, A067153, A067155, A067156, A067157, A067158, A067159.
Sequence in context: A106239 A202857 A055965 * A187486 A141027 A186436
Adjacent sequences: A067151 A067152 A067153 * A067155 A067156 A067157
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KEYWORD
| easy,nonn
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AUTHOR
| Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de), Jan 06 2002
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