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A279444 Number of ways to place n points on an n X n square grid so that no more than 2 points are on a vertical or horizontal straight line. 10
1, 6, 78, 1428, 34020, 1005720, 35526120, 1460297160, 68483325960, 3608847088560, 211125189789360, 13577790144108960, 952129825291925280, 72303731169467878080, 5911241852357814772800, 517670861532464104264800, 48347072773751574327304800 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Rotations and reflections of placements are counted. If they are to be ignored, see A279452.

LINKS

Hiroaki Yamanouchi, Table of n, a(n) for n = 1..100

CROSSREFS

Cf. A279452, A279445.

Sequence in context: A268555 A131926 A132866 * A094419 A229044 A300874

Adjacent sequences:  A279441 A279442 A279443 * A279445 A279446 A279447

KEYWORD

nonn

AUTHOR

Heinrich Ludwig, Dec 23 2016

EXTENSIONS

a(11)-a(17) from Hiroaki Yamanouchi, Jan 04 2017

STATUS

approved

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Last modified September 24 01:21 EDT 2020. Contains 337315 sequences. (Running on oeis4.)