A194192 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A194192

Number of ways to arrange 7 indistinguishable points on an n X n square grid so that no three points are collinear at any angle.

0, 0, 0, 204, 26700, 1073076, 15657764, 159413700, 1108580092, 6030207624, 26852315940, 104865006648, 354993232192, 1098793355508, 3109294280324

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,4

COMMENTS

Column 7 of A194193.

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

Some solutions for 4 X 4:

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

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

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

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

CROSSREFS

Sequence in context: A253680 A209790 A348603 * A339199 A263505 A270605

Adjacent sequences: A194189 A194190 A194191 * A194193 A194194 A194195

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 18 2011

STATUS

approved