OFFSET
1,2
COMMENTS
a(47) is the first open case.
It is conjectured that a(n) < 2n for all sufficiently large n.
A000769 has an extensive list of references and links.
Comment from Warren D. Smith, May 10 2015: 2n is a trivial upper bound, because if you pick 2n+1 points, then some three must lie on a horizontal line.
Apart from the offset this may be the same as A103517. - R. J. Mathar, May 13 2016
LINKS
A. Flammenkamp, Progress in the no-three-in-line problem
A. Flammenkamp, Solutions of the no-three-in-line problem
CROSSREFS
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, May 10 2016
STATUS
approved