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A191712
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Number of n X n symmetric binary matrices with each 1 adjacent to no more than 1 E, S or NW neighboring 1
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1
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2, 6, 32, 299, 4522, 117199, 5102712, 374261742, 46287548443, 9645832171566, 3387747263942416, 2005204912303387717, 2000240978176372394879, 3362663470594685582801758, 9527114534581774926710620628
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history;
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OFFSET
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1,1
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LINKS
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R. H. Hardin, Table of n, a(n) for n = 1..19
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EXAMPLE
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Some solutions for n=5
..1..0..0..1..1....0..0..1..0..0....0..1..0..1..0....0..1..0..0..1
..0..1..0..0..0....0..0..0..0..0....1..0..0..0..0....1..0..1..0..0
..0..0..0..0..0....1..0..0..0..0....0..0..1..0..0....0..1..0..1..0
..1..0..0..0..0....0..0..0..0..1....1..0..0..0..0....0..0..1..0..0
..1..0..0..0..1....0..0..0..1..1....0..0..0..0..0....1..0..0..0..1
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CROSSREFS
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Sequence in context: A133596 A088437 A191691 * A277475 A277484 A005736
Adjacent sequences: A191709 A191710 A191711 * A191713 A191714 A191715
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin Jun 12 2011
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STATUS
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approved
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