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A185833 Half the number of nX7 binary arrays with every element equal to exactly one or two of its horizontal and vertical neighbors 1
8, 421, 5004, 54223, 649826, 7678409, 91052720, 1073661088, 12644950311, 149729950026, 1765937206744, 20858521172073, 246298874943372, 2908556504972388, 34344854423802299, 405576876056939440 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A185835

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

EXAMPLE

Some solutions for 4X7 with a(1,1)=0

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

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

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

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

CROSSREFS

Sequence in context: A188393 A267162 A193372 * A301668 A038781 A092868

Adjacent sequences:  A185830 A185831 A185832 * A185834 A185835 A185836

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 05 2011

STATUS

approved

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Last modified September 18 20:22 EDT 2019. Contains 327181 sequences. (Running on oeis4.)