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Number of Equilateral Triangles in Regular 3n-gon

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  • Antreas
    From SeqFan list: ... [Giovanni Resta]: I got 1, 14, 69, 188, 465 as the first 5 terms, but I m not completely sure about these values. I have created a
    Message 1 of 1 , Apr 10, 2013
      From SeqFan list:

      [Antreas Hatzipolakis]:

      >Which is the number of the regular triangles bounded by sides and >diagonals in a regular 3n-gon?

      [Giovanni Resta]:
      I got 1, 14, 69, 188, 465
      as the first 5 terms, but I'm not completely sure
      about these values.
      I have created a picture of the 69 triangles in the 9-gon,
      grouped by size, here : http://www.iread.it/triang.png
      just to check we are talking about the same problem.
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