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Analog of A140468, but starting with 5 points, and with the constraint that new points (or lines) are formed only from the intersections of lines (or points) of the same generation.
8

%I #5 Jun 20 2014 13:48:29

%S 5,10,20,85,2100

%N Analog of A140468, but starting with 5 points, and with the constraint that new points (or lines) are formed only from the intersections of lines (or points) of the same generation.

%H Shalosh B. Ekhad, Doron Zeilberger, <a href="http://arxiv.org/abs/1406.5157">Enumerative Geometrical Genealogy (Or: The Sex Life of Points and Lines)</a>, arXiv:1406.5157 [math.CO], (19-June-2014)

%Y Related sequences: A140468, A244020-A244026.

%K nonn,more

%O 1,1

%A _N. J. A. Sloane_, Jun 20 2014