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 A067151 Number of regions in regular n-gon which are quadrilaterals (4-gons). 11
 0, 0, 6, 7, 24, 36, 90, 132, 168, 234, 378, 600, 672, 901, 954, 1444, 1580, 2520, 2860, 2990, 3696, 4800, 5070, 6750, 7644, 9309, 7920, 12927, 12896, 15576, 16898, 20475, 18684, 25382, 27246, 30966, 32760, 37064, 37170, 45838, 47300, 55350, 60996 (list; graph; refs; listen; history; text; internal format)
 OFFSET 4,3 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, arXiv version, which has fewer typos than the SIAM version. B. Poonen and M. Rubinstein, Mathematica programs for these sequences EXAMPLE a(6)=6 because the 6 regions around the center are quadrilaterals. CROSSREFS Cf. A007678, A067163, A064869, A067152, A067153, A067154, A067155, A067156, A067157, A067158, A067159. Sequence in context: A282659 A287140 A288771 * A219916 A135987 A259088 Adjacent sequences:  A067148 A067149 A067150 * A067152 A067153 A067154 KEYWORD easy,nonn AUTHOR Sascha Kurz, Jan 06 2002 STATUS approved

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Last modified October 23 23:51 EDT 2019. Contains 328379 sequences. (Running on oeis4.)