A183367 Number of nX5 binary arrays with no element equal to the sum mod 3 of its horizontal and vertical neighbors

4, 21, 108, 548, 3102, 17101, 95674, 543837, 3094889, 17654882, 100922299, 576885277, 3298560872, 18868606128, 107935859047, 617459322870, 3532519181939, 20210076149240, 115625671366613, 661524633792529

Offset

1,1

Comments

Column 5 of A183368

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

Example

Some solutions for 7X5
..0..1..1..0..1....0..1..0..1..1....1..1..1..1..0....0..1..0..1..1
..1..1..1..0..0....0..0..0..1..1....1..0..0..1..0....1..0..0..1..1
..1..0..1..0..1....1..0..0..0..0....1..0..0..1..1....0..0..0..1..0
..1..1..1..0..0....0..0..1..1..0....1..1..1..0..1....0..1..1..1..0
..0..0..0..0..0....0..1..1..1..0....0..0..1..1..1....1..1..0..0..1
..0..0..1..1..1....1..1..0..1..1....1..0..0..0..0....1..1..0..0..0
..1..0..1..1..1....1..1..1..1..1....0..0..1..0..1....1..1..0..1..0

Crossrefs

Sequence in context: A014986 A015531 A083425 * A100237 A117381 A010908

Adjacent sequences: A183364 A183365 A183366 * A183368 A183369 A183370

Keyword

nonn

Author

R. H. Hardin Jan 04 2011

Status

approved