A187931 Number of (n+2)X(n+2) binary arrays with every 2X2 subblock sum equal to some diagonal or antidiagonal neighbor 2X2 subblock sum

48, 104, 7616, 544222, 167909728

Offset

1,1

Comments

Diagonal of A187940

Links

Table of n, a(n) for n=1..5.

Example

Some solutions for 4X4
..0..1..0..0....1..1..0..1....0..1..0..0....1..1..1..1....1..0..1..1
..1..0..1..1....0..0..0..1....1..0..1..1....0..1..0..1....0..1..0..0
..0..1..0..0....0..1..1..1....0..1..0..1....1..1..1..1....1..0..1..1
..1..0..1..1....0..1..0..0....0..1..1..0....1..0..1..0....0..1..0..0

Crossrefs

Sequence in context: A113797 A260294 A260287 * A191837 A044235 A044616

Adjacent sequences: A187928 A187929 A187930 * A187932 A187933 A187934

Keyword

nonn

Author

R. H. Hardin Mar 16 2011

Status

approved