

A235458


Number of nonequivalent (mod D_4) ways to arrange 7 points on an n X n square grid so that no three points are collinear.


6



28, 3385, 134353, 1958674, 19929645, 138586349, 753795278, 3356614240, 13108210508, 44374441652, 137349454120
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

4,1


COMMENTS

Without the restriction "nonequivalent (mod D_4)" the numbers are given by A194192, n >= 4.


LINKS



EXAMPLE

There are a(4) = 28 nonequivalent ways to place 7 points (X) on a 4 X 4 grid. Example:
. X X .
. . . X
X . . X
X X . .


CROSSREFS



KEYWORD

nonn,more


AUTHOR



EXTENSIONS



STATUS

approved



