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 A067153 Number of regions in regular n-gon which are hexagons. 11
 0, 0, 0, 9, 0, 22, 0, 39, 0, 105, 48, 136, 18, 190, 120, 462, 66, 644, 72, 875, 390, 1296, 952, 1595, 450, 1891, 1472, 3201, 2346, 3640, 2124, 4773, 2698, 5577, 4000, 7298, 3444, 7912, 6336, 10980, 6532, 10904, 7824, 14651, 12150, 16779, 13260, 20299 (list; graph; refs; listen; history; text; internal format)
 OFFSET 6,4 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(9)=9 because drawing the regular 9-gon with all its diagonals yields 9 hexagons. CROSSREFS Cf. A007678, A067165, A064869, A067151, A067152, A067154, A067155, A067156, A067157, A067158, A067159. Sequence in context: A299154 A070929 A007394 * A057405 A167354 A005066 Adjacent sequences:  A067150 A067151 A067152 * A067154 A067155 A067156 KEYWORD easy,nonn AUTHOR Sascha Kurz, Jan 06 2002 STATUS approved

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Last modified August 22 02:44 EDT 2019. Contains 326169 sequences. (Running on oeis4.)