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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

Table of n, a(n) for n=1..6.

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

Adjacent sequences:  A186828 A186829 A186830 * A186832 A186833 A186834

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 27 2011

STATUS

approved

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Last modified November 13 02:59 EST 2019. Contains 329085 sequences. (Running on oeis4.)