[seqfan] possible number of intersection points made by line segments connecting all pairs of points
Max Alekseyev
maxale at gmail.com
Fri Jun 9 23:34:55 CEST 2023
A recent question at MO: https://mathoverflow.net/q/448407
concerns the sequence of possible values for the number of inner
intersection points made by the line segments connecting all pairs of some
set of points in general position (no three points are on the same line).
Is it present in the OEIS?
It looks like a non-convex generalization of https://oeis.org/A000332
(Number of intersection points of diagonals of convex n-gon where no more
than two diagonals intersect at any point in the interior.)
Regards,
Max
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