A185833 - OEIS

A185833

Half the number of nX7 binary arrays with every element equal to exactly one or two of its horizontal and vertical neighbors

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: A267162 A193372 A368002 * A301668 A038781 A092868

Adjacent sequences: A185830 A185831 A185832 * A185834 A185835 A185836

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 05 2011

STATUS

approved