

A140468


Number of points at the nth step of the following iteration, starting with four points in general position in the real projective plane: dualize the current pointset to a family of lines, take all intersections of those lines, repeat.


9




OFFSET

1,1


LINKS



EXAMPLE

a(2)=6 because four points in general position define six lines.


CROSSREFS



KEYWORD

hard,more,nonn


AUTHOR

Joshua Cooper (cooper(AT)math.sc.edu), Jun 28 2008


STATUS

approved



