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A213412 Half the number of n X n binary arrays with no 3X3 submatrix formed with any three rows and columns equal to J-I 0
1, 8, 253, 28952, 10142461, 9107867048, 18095156337973 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A213418

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A301401 A162132 A297051 * A226428 A277421 A171612

Adjacent sequences:  A213409 A213410 A213411 * A213413 A213414 A213415

KEYWORD

nonn

AUTHOR

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

STATUS

approved

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Last modified January 28 03:39 EST 2020. Contains 331317 sequences. (Running on oeis4.)