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A188826
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Number of 4Xn binary arrays without the pattern 0 1 diagonally or antidiagonally
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1
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16, 25, 81, 256, 841, 2704, 8836, 28561, 93025, 301401, 980100, 3179089, 10329796, 33524100, 108889225, 353477601, 1147922161, 3726858304, 12101980081, 39292754176, 127587553636, 414263438689, 1345129081209, 4367552437161
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OFFSET
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1,1
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COMMENTS
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Row 4 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) = 3*a(n-1) +5*a(n-2) -15*a(n-3) +3*a(n-4) +5*a(n-5) -a(n-6) for n>7
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EXAMPLE
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Some solutions for 4X3
..0..1..1....0..1..0....1..1..1....0..1..0....1..1..0....0..1..0....1..1..1
..0..0..1....1..0..1....1..1..1....0..0..0....1..0..1....1..0..0....1..1..1
..0..0..0....0..0..0....0..0..1....0..0..0....0..1..0....0..0..0....1..1..1
..0..0..0....0..0..0....0..0..0....0..0..0....0..0..1....0..0..0....0..1..1
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CROSSREFS
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Sequence in context: A065408 A112392 A109685 * A152152 A061101 A166672
Adjacent sequences: A188823 A188824 A188825 * A188827 A188828 A188829
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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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