Number of Equilateral Triangles in Regular 3n-gon
- From SeqFan list:
>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.