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 A191572 Number of nXn symmetric binary matrices with each 1 adjacent to no more than 4 knight-move neighboring 1s 0
 2, 8, 64, 1024, 24975, 1117404, 98925520, 16397607520, 4973951282668, 2743737089908402, 2786025507390606149 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS EXAMPLE Some solutions for n=6 ..0..1..0..0..1..0....0..1..0..1..0..0....0..0..0..1..1..0....0..1..1..0..1..0 ..1..0..0..1..1..1....1..0..0..0..0..0....0..0..0..0..1..1....1..0..0..1..1..0 ..0..0..1..0..0..1....0..0..0..0..0..1....0..0..0..0..0..0....1..0..0..0..1..1 ..0..1..0..0..0..1....1..0..0..0..0..0....1..0..0..0..0..0....0..1..0..1..0..1 ..1..1..0..0..0..0....0..0..0..0..0..1....1..1..0..0..1..1....1..1..1..0..0..0 ..0..1..1..1..0..0....0..0..1..0..1..1....0..1..0..0..1..1....0..0..1..1..0..1 CROSSREFS Sequence in context: A153534 A153563 A178169 * A191573 A136283 A139680 Adjacent sequences:  A191569 A191570 A191571 * A191573 A191574 A191575 KEYWORD nonn AUTHOR R. H. Hardin Jun 06 2011 STATUS approved

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