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A206870
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Number of nX7 0..1 arrays avoiding 0 0 0 horizontally and 1 0 1 vertically
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1
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81, 6561, 165783, 4108471, 115505069, 3254925997, 90497940567, 2513905109615, 69918135147567, 1945015733467487, 54104019551291657, 1504951979516380911, 41861310528949142861, 1164403984942205341081, 32388853771860099448897
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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=4
..0..1..1..1..1..0..1....0..1..1..1..0..0..1....1..0..1..1..1..0..0
..0..1..0..1..1..0..1....0..0..1..0..1..1..0....0..1..0..1..1..0..1
..1..1..0..0..1..0..1....0..0..1..0..1..1..0....0..1..0..1..0..1..1
..0..1..1..0..1..1..1....0..1..1..1..0..1..1....0..0..1..1..0..0..1
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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