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 A067154 Number of regions in regular n-gon which are heptagons. 10
 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; text; internal format)
 OFFSET 7,9 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. 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). EXAMPLE a(7)=1 because the center-region is a heptagon. CROSSREFS Cf. A007678, A067166, A064869, A067151, A067152, A067153, A067155, A067156, A067157, A067158, A067159. Sequence in context: A271339 A202857 A055965 * A187486 A141027 A186436 Adjacent sequences:  A067151 A067152 A067153 * A067155 A067156 A067157 KEYWORD easy,nonn AUTHOR Sascha Kurz, Jan 06 2002 STATUS approved

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Last modified October 17 19:58 EDT 2019. Contains 328128 sequences. (Running on oeis4.)