A184068 Number of (n+1)X7 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

81, 225, 1884, 22452, 288744, 2663589, 19694227, 116690636, 572683182, 2305864084, 7782298646, 22382616957, 56141874238, 124734871342, 249667791032, 456693083041, 773758373131, 1229106077318, 1850219475619, 2663743231907

Offset

1,1

Comments

Column 6 of A184071

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

Example

Some solutions for 3X7
..0..0..0..1..1..1..1....0..0..0..1..1..1..1....0..0..0..0..1..1..1
..0..1..1..0..1..1..1....0..1..1..0..0..0..1....0..0..1..1..0..0..0
..1..0..0..1..1..1..1....1..0..0..0..1..1..0....0..1..0..0..0..1..1
...
...1..2..2..3..4..4.......1..2..2..2..2..3.......0..1..2..2..2..2...
...2..2..2..3..4..4.......2..2..1..1..2..2.......1..2..2..1..1..2...

Crossrefs

Sequence in context: A378789 A062532 A075730 * A211690 A205055 A335843

Adjacent sequences: A184065 A184066 A184067 * A184069 A184070 A184071

Keyword

nonn

Author

R. H. Hardin Jan 09 2011

Status

approved