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A188827
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Number of 5Xn binary arrays without the pattern 0 1 diagonally or antidiagonally
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1
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32, 36, 120, 400, 1360, 4624, 15776, 53824, 183744, 627264, 2141568, 7311616, 24963328, 85229824, 290992640, 993510400, 3392056320, 11581203456, 39540701184, 135000395776, 460920180736, 1573679927296, 5372879347712
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OFFSET
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1,1
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COMMENTS
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Row 5 of A188824
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LINKS
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R. H. Hardin, Table of n, a(n) for n = 1..200
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FORMULA
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Empirical: a(n) = 4*a(n-1) -8*a(n-3) +4*a(n-4) for n>5
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EXAMPLE
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Some solutions for 5X3
..1..1..1....0..1..1....1..1..1....1..1..1....1..0..1....1..0..1....0..1..1
..1..1..1....1..0..1....1..1..1....1..1..1....0..0..0....0..1..0....1..0..1
..1..1..1....0..1..0....1..1..1....1..1..1....0..0..0....1..0..1....0..0..0
..1..0..0....1..0..0....1..0..1....1..0..1....0..0..0....0..1..0....0..0..0
..0..0..0....0..0..0....0..1..0....0..0..0....0..0..0....1..0..0....0..0..0
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CROSSREFS
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Sequence in context: A095463 A095457 A045226 * A030094 A082591 A070624
Adjacent sequences: A188824 A188825 A188826 * A188828 A188829 A188830
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin Apr 11 2011
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STATUS
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approved
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