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A194191 Number of ways to arrange 6 indistinguishable points on an n X n square grid so that no three points are collinear at any angle. 3
0, 0, 2, 998, 36698, 620210, 5367308, 34678364, 169259212, 682686652, 2356999994, 7294368210, 20227526910, 52008171998, 124422857864, 279767468172, 596674510744, 1218556387684, 2385034544810, 4509309201242 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Column 6 of A194193.

LINKS

Table of n, a(n) for n=1..20.

EXAMPLE

Some solutions for 4 X 4:

..1..0..1..0....0..1..1..0....1..0..0..1....0..1..0..0....0..1..0..1

..0..0..0..1....1..0..0..0....0..0..1..1....0..0..1..1....0..0..0..1

..0..1..0..0....0..1..1..0....0..0..0..0....0..0..1..0....0..0..1..0

..0..0..1..1....1..0..0..0....0..1..1..0....1..0..0..1....1..0..1..0

CROSSREFS

Sequence in context: A176940 A172386 A079233 * A190579 A271527 A214543

Adjacent sequences:  A194188 A194189 A194190 * A194192 A194193 A194194

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 18 2011

STATUS

approved

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Last modified October 22 04:04 EDT 2018. Contains 316431 sequences. (Running on oeis4.)