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A181038
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Number of nX4 binary matrices with no initial bit string in any row or column divisible by 6
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0
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1, 6, 18, 108, 410, 2128, 8877, 42883, 186732, 872119, 3875520, 17814874, 79942755, 364719182, 1644428972, 7475300460, 33782717781, 153302897126, 693611114280, 3144849890670
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OFFSET
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1,2
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COMMENTS
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Column 4 of A181039
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LINKS
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Table of n, a(n) for n=1..20.
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EXAMPLE
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Some solutions for 6X4
..1..1..1..1....1..1..1..1....1..1..1..1....1..1..1..1....1..1..1..1
..1..0..0..0....1..0..0..1....1..0..1..0....1..0..0..1....1..0..0..0
..1..1..1..1....1..0..0..1....1..0..1..1....1..0..0..1....1..1..1..0
..1..0..1..0....1..0..1..0....1..1..1..1....1..1..1..1....1..1..1..0
..1..0..1..0....1..0..1..1....1..1..1..0....1..1..1..1....1..0..1..1
..1..1..1..0....1..0..1..0....1..1..1..0....1..0..0..0....1..0..0..0
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CROSSREFS
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Sequence in context: A151470 A009573 A052655 * A222857 A108735 A143556
Adjacent sequences: A181035 A181036 A181037 * A181039 A181040 A181041
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin Sep 30 2010
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STATUS
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approved
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