OFFSET
3,3
COMMENTS
Alternatively, the number of equivalence classes of an equivalence relation on the polygonal regions in a regular n-gon with all diagonals drawn, where two regions are equivalent iff they are similar.
LINKS
Bjorn Poonen and Michael Rubinstein, The Number of Intersection Points Made by the Diagonals of a Regular Polygon, SIAM J. Discrete Mathematics 11 (1998), nr. 1, pp. 135-156; doi: 10.1137/S0895480195281246; arXiv version, arXiv:math/9508209 [math.MG], 1995-2006.
Christopher Scussel, Illustration of similarity without congruence at a(10)
EXAMPLE
This sequence is the same as A187781 for n<10 because n=10 is the smallest n such that there exist regions that are similar but not congruent.
CROSSREFS
KEYWORD
nonn
AUTHOR
Christopher Scussel, Jun 30 2023
STATUS
approved