A194190 Number of ways to arrange 5 indistinguishable points on an n X n square grid so that no three points are collinear at any angle.

0, 0, 28, 1668, 25052, 215448, 1189868, 5199888, 18520572, 56978440, 155627304, 388897892, 894254904, 1932504496, 3945470564, 7669533756, 14291010972, 25694009628, 44662697948, 75451394832, 124066723008, 199190308172

Offset

1,3

Comments

Column 5 of A194193.

Links

R. H. Hardin, Table of n, a(n) for n = 1..24

Example

Some solutions for 3 X 3:
..0..1..0....1..0..1....0..1..1....1..1..0....1..1..0....1..1..0....1..0..1
..0..1..1....1..1..0....1..0..0....1..0..1....1..0..0....0..0..1....1..0..0
..1..0..1....0..1..0....0..1..1....0..0..1....0..1..1....1..1..0....0..1..1

Crossrefs

Sequence in context: A335370 A335368 A339120 * A190397 A004705 A182400

Adjacent sequences: A194187 A194188 A194189 * A194191 A194192 A194193

Keyword

nonn

Author

R. H. Hardin, Aug 18 2011

Status

approved