A184062 Number of (n+1)X(n+1) binary arrays with rows and columns in nondecreasing order and with no 2X2 subblock sum differing from a horizontal or vertical neighbor subblock sum by more than one

7, 16, 130, 1918, 56723, 2663589, 262752720, 52431215293, 22708430287929, 21448555991084059

Offset

1,1

Comments

Diagonal of A184071

Links

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

Example

Some solutions for 4X4
..0..0..1..1....0..0..1..1....0..0..1..1....0..1..1..1....0..0..1..1
..0..1..0..1....0..1..0..0....0..1..0..1....1..0..0..0....0..1..0..1
..0..1..1..1....1..0..0..1....0..1..1..1....1..0..1..1....0..1..1..1
..1..0..0..0....1..1..1..0....1..1..0..0....1..1..0..0....1..0..1..1
...
...1..2..3.......1..2..2.......1..2..3.......2..2..2.......1..2..3...
...2..3..3.......2..1..1.......2..3..3.......2..1..2.......2..3..3...
...2..2..2.......3..2..2.......3..3..2.......3..2..2.......2..3..4...

Crossrefs

Sequence in context: A181777 A332573 A129422 * A101122 A090535 A107778

Adjacent sequences: A184059 A184060 A184061 * A184063 A184064 A184065

Keyword

nonn

Author

R. H. Hardin Jan 09 2011

Status

approved