A111024 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.

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, 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, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1

Offset

1,1

References

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

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

Links

Table of n, a(n) for n=1..91.

Example

1; 1,1; 1,1,1; 1,1,1,1; 1,1,1,1,1; 1,1,0,1,1,1

Crossrefs

Sequence in context: A014332 A014655 A362448 * A015586 A015700 A015852

Adjacent sequences: A111021 A111022 A111023 * A111025 A111026 A111027

Keyword

nonn,tabl

Author

Floor van Lamoen, Oct 05 2005

Status

approved