A213417 Half the number of nX7 binary arrays with no 3X3 submatrix formed with any three rows and columns equal to J-I

64, 8192, 854473, 72544970, 5190742489, 323797652462, 18095156337973

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