OFFSET
1,1
COMMENTS
The case n=2 is a degenerate polygon (two sides connecting two vertices). The two possibilities are when the edges cross and do not cross. Polygons start at n=3 with a triangle.
LINKS
Marko Riedel, Hexagonal tiles.
Marko Riedel, Maple code for number of tiles using Burnside lemma.
FORMULA
a(n) = A289191(prime(n))
CROSSREFS
KEYWORD
nonn
AUTHOR
Marko Riedel, Jul 02 2017
STATUS
approved