7,5

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.

Table of n, a(n) for n=7..69.

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).

Sequences formed by drawing all diagonals in regular polygon

Cf. A067153.

Sequence in context: A163974 A317443 A308218 * A079981 A117776 A298610

Adjacent sequences: A067162 A067163 A067164 * A067166 A067167 A067168

easy,nonn

Sascha Kurz, Jan 06 2002

approved