A186802 Number of (n+2)X7 binary arrays with no 3X3 subblock commuting with any horizontal or vertical neighbor 3X3 subblock.

1916364, 207885695, 22986441710, 2543130767720, 281222068231208, 31102381776833744, 3439855711337907764, 380438338036924395628, 42075486550662042557800, 4653437870679555570938770

Offset

1,1

Comments

Column 5 of A186806

Links

R. H. Hardin, Table of n, a(n) for n = 1..22

Example

Some solutions for 4X7
..0..1..1..1..1..0..0....0..0..1..1..1..0..1....1..1..1..1..0..1..1
..0..0..0..1..0..1..0....0..0..0..1..1..1..1....0..0..0..1..0..0..0
..1..0..0..1..1..0..1....1..0..0..1..0..1..1....1..0..0..0..1..0..1
..0..0..0..1..1..1..1....0..0..0..0..0..1..0....0..0..0..1..1..0..0

Crossrefs

Sequence in context: A215568 A323343 A391138 * A179226 A166002 A285390

Adjacent sequences: A186799 A186800 A186801 * A186803 A186804 A186805

Keyword

nonn

Author

R. H. Hardin, Feb 26 2011

Status

approved