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 A067152 Number of regions in regular n-gon which are pentagons. 12
 1, 0, 7, 0, 18, 10, 44, 0, 117, 98, 150, 128, 357, 72, 646, 580, 903, 814, 1564, 840, 2050, 2106, 2862, 2128, 3625, 1440, 5146, 4896, 6105, 5542, 8190, 7452, 10471, 10184, 14235, 13160, 16564, 11382, 21156, 20548, 24300, 23920, 30362, 26112, 35231, 32700, 40341, 38532, 51834, 42012, 58905 (list; graph; refs; listen; history; text; internal format)
 OFFSET 5,3 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 Scott R. Shannon, Table of n, a(n) for n = 5..765 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(5)=1 because the center-region is a pentagon. CROSSREFS Cf. A007678, A067164, A064869, A067151, A067153, A067154, A067155, A067156, A067157, A067158, A067159. Sequence in context: A348516 A245543 A225949 * A052440 A246919 A167299 Adjacent sequences:  A067149 A067150 A067151 * A067153 A067154 A067155 KEYWORD nonn AUTHOR Sascha Kurz, Jan 06 2002 EXTENSIONS a(49) and beyond by Scott R. Shannon, Dec 04 2021 STATUS approved

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Last modified August 10 08:49 EDT 2022. Contains 356039 sequences. (Running on oeis4.)