A181010 - OEIS

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A181010

Number of n X n 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, 1, 1, 1, 2, 8, 59, 744, 19644, 1150827, 158171825, 54785832985, 50665615156541

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,5

COMMENTS

Diagonal of A181011

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

All solutions for 6X6

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

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

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

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

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

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

...

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

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

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

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

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

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

CROSSREFS

Sequence in context: A205075 A203217 A203208 * A197941 A295502 A196076

Adjacent sequences: A181007 A181008 A181009 * A181011 A181012 A181013

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 30 2010

STATUS

approved