A186836 Number of (n+2)X7 binary arrays with 3X3 subblock sums nondecreasing rightwards and downwards.

324576, 6019798, 111211414, 1919555447, 21242244160, 235234097572, 2571152951156, 20663923742904, 166164319255080

Offset

1,1

Comments

Column 5 of A186840

Links

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

Example

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

Crossrefs

Sequence in context: A233978 A375264 A263154 * A237223 A250910 A015360

Adjacent sequences: A186833 A186834 A186835 * A186837 A186838 A186839

Keyword

nonn

Author

R. H. Hardin, Feb 27 2011

Status

approved