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A188868
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Number of nX3 binary arrays without the pattern 0 0 0 antidiagonally or horizontally
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4
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7, 49, 316, 2032, 13045, 83737, 537496, 3450100, 22145617, 142149013, 912430732, 5856740200, 37593435373, 241305971377, 1548902653984, 9942146967292, 63816977822953, 409630502531629, 2629349654724052, 16877355480293296
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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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FORMULA
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Empirical: a(n) = 7*a(n-1) -3*a(n-2) -5*a(n-3) +2*a(n-4)
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EXAMPLE
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Some solutions for 4X3
..0..1..1....1..0..1....0..1..0....1..1..1....1..0..0....0..1..1....0..0..1
..1..0..1....0..1..0....1..1..0....1..0..1....1..1..0....1..1..1....0..1..0
..1..1..0....0..1..1....0..1..1....1..0..0....0..1..0....1..1..1....0..1..1
..1..1..0....0..1..1....1..1..0....1..1..1....1..0..0....0..0..1....1..0..0
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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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