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A186831 Number of (n+2)X(n+2) binary arrays with 3X3 subblock sums nondecreasing rightwards and downwards. 0
512, 19904, 1537476, 209888936, 21242244160, 3176962520030 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Diagonal of A186840
LINKS
EXAMPLE
Some solutions for 4X4
..1..0..1..0....1..0..1..0....1..1..0..0....0..0..0..0....1..1..0..1
..1..0..0..1....0..0..1..1....0..0..1..1....0..0..0..1....0..0..0..1
..0..0..0..1....1..1..1..1....0..1..1..0....1..0..0..0....1..1..0..0
..1..1..0..1....1..1..0..1....1..1..0..0....1..1..1..1....0..1..1..0
CROSSREFS
Sequence in context: A231308 A254735 A254914 * A236215 A254182 A253954
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 27 2011
STATUS
approved

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Last modified July 20 09:46 EDT 2024. Contains 374445 sequences. (Running on oeis4.)