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A213417 Half the number of nX7 binary arrays with no 3X3 submatrix formed with any three rows and columns equal to J-I 0
64, 8192, 854473, 72544970, 5190742489, 323797652462, 18095156337973 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A213418

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A302014 A302009 A301783 * A316807 A317524 A299653

Adjacent sequences:  A213414 A213415 A213416 * A213418 A213419 A213420

KEYWORD

nonn

AUTHOR

R. H. Hardin and N. J. A. Sloane Jun 10 2012

STATUS

approved

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Last modified May 9 10:05 EDT 2021. Contains 343719 sequences. (Running on oeis4.)