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A037188 Number of ways of placing 2n points on n X n grid so no 3 are in a line (solutions with symmetry about both main diagonals). 1
0, 0, 1, 1, 0, 2, 0, 0, 0, 1, 0, 2, 1, 3, 1, 1, 0, 2, 0, 2, 0, 1, 1, 2, 2, 0, 0, 0, 1, 1, 2, 1, 0, 0, 1, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

Table of n, a(n) for n=1..45.

A. Flammenkamp, Solutions of the no-three-in-line problem

A. Flammenkamp, Solutions of the no-three-in-line problem

A. Flammenkamp, Progress in the no-three-in-line problem, J. Combinat. Theory A 60 (1992), 305-311.

A. Flammenkamp, Progress in the no-three-in-line problem. II, J. Combin. Theory Ser. A 81 (1998), no. 1, 108-113.

CROSSREFS

Cf. A000769.

Sequence in context: A079127 A056674 A227761 * A276847 A271231 A306798

Adjacent sequences:  A037185 A037186 A037187 * A037189 A037190 A037191

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane.

EXTENSIONS

More terms from Flammenkamp web site, May 24 2005

STATUS

approved

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Last modified November 18 01:41 EST 2019. Contains 329242 sequences. (Running on oeis4.)