A187720 Number of (n+1)X(n+1) binary arrays with no 2X2 subblock commuting with any of its horizontal and vertical 2X2 subblock neighbors

16, 174, 3698, 161571, 13555195, 2287444987, 755272970945, 491415809239410, 627561470269866658, 1574769693877593164368

Offset

1,1

Comments

Diagonal of A187729

Links

Table of n, a(n) for n=1..10.

Example

Some solutions for 3X3
..0..0..1....1..0..1....1..0..1....0..1..1....1..1..1....1..0..0....1..1..1
..1..1..1....1..1..0....1..1..0....0..1..0....0..0..1....1..0..1....0..1..0
..0..1..0....1..1..0....1..1..1....1..1..1....1..0..1....1..1..0....1..0..0

Crossrefs

Sequence in context: A021374 A253343 A215687 * A017931 A021129 A268869

Adjacent sequences: A187717 A187718 A187719 * A187721 A187722 A187723

Keyword

nonn

Author

R. H. Hardin Mar 13 2011

Status

approved