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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 July 23 07:30 EDT 2024. Contains 374545 sequences. (Running on oeis4.)