OFFSET
3,3
COMMENTS
Beginning from number of sides equal to 12 the terms no longer increase between rows. For example, the number of inner diagonal intersection points for the regular 12-gon is fewer than the number of inner diagonal intersection points for regular 11-gon.
Obviously there exists a number k_0 such that k_0 is not in the sequence and k is in the sequence for all k > k_0.
LINKS
Vladimir Letsko, Mathematical Marathon at vspu, Problem 102 (in Russian)
Vladimir Letsko Illustration of all cases for number of sides from 3 to 8
V. A. Letsko and M. A. Voronina Classification of convex polygons, Grani Poznaniya, 1(11), 2011 (in Russian).
EXAMPLE
The beginning of the irregular triangle is:
3| 0
4| 1
5| 5
6| 13, 15
7| 29, 31, 33, 35
8| 49, 52, 53, 54, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 68, 70
CROSSREFS
KEYWORD
tabf,more,nonn
AUTHOR
Vladimir Letsko, Oct 21 2013
STATUS
approved