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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 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 December 4 09:27 EST 2022. Contains 358556 sequences. (Running on oeis4.)