A183803 1/16 the number of (n+1)X(n+1) binary arrays with no 2X2 subblock being a reflection across the shared element pair of any horizontal or vertical neighbor

1, 13, 322, 16953, 1701473, 360549804, 148654946039, 127200605449247, 215287155239348168

Offset

1,2

Comments

Diagonal of A183811

Links

Table of n, a(n) for n=1..9.

Example

Some solutions with upper left block zero for 3X3
..0..0..1....0..0..1....0..0..0....0..0..1....0..0..1....0..0..1....0..0..1
..0..0..0....0..0..1....0..0..1....0..0..1....0..0..0....0..0..1....0..0..1
..0..1..1....0..1..1....0..1..0....1..1..0....1..1..0....0..1..0....1..0..0

Crossrefs

Sequence in context: A297437 A166743 A212733 * A253458 A012492 A296395

Adjacent sequences: A183800 A183801 A183802 * A183804 A183805 A183806

Keyword

nonn

Author

R. H. Hardin Jan 07 2011

Status

approved