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A181015 Number of nX(n+4) binary matrices with rows and columns each in strictly increasing order as binary numbers and every 0 adjacent to a 1 and every 1 adjacent to a 0 0
0, 0, 0, 0, 0, 0, 85, 14885, 4279160, 2134653096, 2320636820510, 6138217538155860 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

COMMENTS

Superdiagonal 4 of A181011

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

Some solutions for 7X11

..0..1..1..1..1..1..1..1..1..1..1....0..1..1..1..1..1..1..1..1..1..1

..1..0..0..0..0..0..0..0..0..0..0....1..0..0..0..0..0..0..0..0..0..0

..1..0..0..1..1..1..1..1..1..1..1....1..0..0..1..1..1..1..1..1..1..1

..1..0..1..0..0..0..0..1..1..1..1....1..0..1..0..0..0..0..0..0..1..1

..1..0..1..0..0..1..1..0..0..0..0....1..0..1..0..0..1..1..1..1..0..0

..1..0..1..0..0..1..1..0..0..1..1....1..0..1..0..1..0..0..1..1..0..1

..1..0..1..0..1..0..1..0..1..0..1....1..0..1..0..1..0..1..0..1..0..0

CROSSREFS

Sequence in context: A011813 A006106 A015338 * A131750 A239269 A068749

Adjacent sequences:  A181012 A181013 A181014 * A181016 A181017 A181018

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 30 2010

STATUS

approved

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Last modified April 18 17:20 EDT 2019. Contains 322229 sequences. (Running on oeis4.)