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 A331929 The number of regions inside a pentagon formed by the straight line segments mutually connecting all vertices and all points that divide the sides into n equal parts. 12
 11, 170, 1161, 3900, 10741, 22380, 44491, 76610, 126336, 194070, 290651, 410860, 577721, 779340, 1035676, 1345030, 1730696, 2176040, 2724036, 3345880, 4087656, 4933200, 5921991, 7018210, 8300896, 9723300, 11339151, 13122120, 15150271, 17345140, 19843056 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The terms are from numeric computation - no formula for a(n) is currently known. LINKS Lars Blomberg, Table of n, a(n) for n = 1..35 Scott R. Shannon, Pentagon regions for n = 1. Scott R. Shannon, Pentagon regions for n = 2. Scott R. Shannon, Pentagon regions for n = 3. Scott R. Shannon, Pentagon regions for n = 4. Scott R. Shannon, Pentagon regions for n = 5. Scott R. Shannon, Pentagon regions for n = 6. Scott R. Shannon, Pentagon regions for n = 7. Scott R. Shannon, Pentagon regions for n = 8. Scott R. Shannon, Pentagon regions for n = 5, random distance-based coloring. Scott R. Shannon, Pentagon regions for n = 6, random distance-based coloring Wikipedia, Pentagon. CROSSREFS Cf. A331939 (n-gons), A329710 (edges), A330847 (vertices), A007678, A092867, A331452, A331931. Sequence in context: A157944 A233290 A167245 * A205087 A064182 A139792 Adjacent sequences:  A331926 A331927 A331928 * A331930 A331931 A331932 KEYWORD nonn AUTHOR Scott R. Shannon and N. J. A. Sloane, Feb 01 2020 EXTENSIONS a(9) and beyond from Lars Blomberg, May 11 2020 STATUS approved

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Last modified September 26 01:25 EDT 2020. Contains 337346 sequences. (Running on oeis4.)