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Triangle read by rows: T(n,s), 0<=s<n, = 1 if there exist in the Euclidean plane n lines with exactly s points of intersection of these lines on each line, otherwise 0.
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%I #4 Mar 02 2015 16:08:49

%S 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,1,1,0,1,1,1,1,1,1,0,1,1,1,

%T 1,1,1,1,0,0,1,1,1,1,1,1,1,0,0,1,1,1,1,1,1,1,1,0,0,0,1,1,1,1,1,1,1,1,

%U 0,0,0,1,1,1,1,1,1,1,1,1,0,0,0,0,1,1,1,1,1,1,1

%N Triangle read by rows: T(n,s), 0<=s<n, = 1 if there exist in the Euclidean plane n lines with exactly s points of intersection of these lines on each line, otherwise 0.

%D B. Gruenbaum, 'Points on lines' revisited, Nieuw Tijdschr. Wisk., 68 (1980-81), 209-213.

%D F. Heierman, Punten op lijnen, Nieuw Tijdschr. Wisk., 67 (1979-80) 113-120.

%e 1; 1,1; 1,1,1; 1,1,1,1; 1,1,1,1,1; 1,1,0,1,1,1

%K nonn,tabl

%O 1,1

%A _Floor van Lamoen_, Oct 05 2005