OFFSET
2,1
COMMENTS
No formula for a(n) is currently known.
LINKS
Scott R. Shannon, Image of the 6-gon.
Scott R. Shannon, Image of the 10-gon.
Scott R. Shannon, Image of the 18-gon.
Scott R. Shannon, Image of the 30-gon.
EXAMPLE
a(3) = 5 as a diagonal of a 6-gon, when all its vertices are connected by lines and where the diagonal passes through the center of the 6-gon, has five vertices on it - the two outer vertices, the central vertex, and two more vertices formed by intersections of the central diagonal with other diagonals. See the linked image of the 6-gon.
CROSSREFS
KEYWORD
nonn
AUTHOR
Scott R. Shannon, Feb 25 2022
STATUS
approved