OFFSET
9,27
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 = 9..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(9)=1 because drawing the regular 9-gon with all its diagonals yields 1 9-gon.
CROSSREFS
KEYWORD
nonn
AUTHOR
Sascha Kurz, Jan 06 2002
EXTENSIONS
a(86) and beyond by Scott R. Shannon, Dec 04 2021
STATUS
approved