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A186584
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Number of (n+3)X7 0..2 arrays with every 4X4 subblock commuting with each horizontal and vertical neighbor 4X4 subblock
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1
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192026, 12263, 39757, 163723, 293665, 328891, 335737, 342691, 350257, 364195, 406729, 574195, 1025233, 1707435, 2460521, 3477379, 5076513, 7165851, 9482025, 12660675, 17905953, 25496043, 35045977, 48354579, 68994705, 98503131
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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)=2*a(n-1)-a(n-2)+2*a(n-4)-4*a(n-5)+2*a(n-6)+2*a(n-8)-2*a(n-9) for n>14
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EXAMPLE
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Some solutions for 5X7
..0..0..0..0..0..2..0....0..0..0..0..0..0..2....0..0..0..0..0..0..0
..0..0..0..0..0..0..0....0..0..0..0..0..0..0....0..0..0..0..0..0..2
..0..0..0..0..0..0..2....0..0..0..0..0..0..1....1..0..0..0..0..0..0
..0..0..0..0..0..0..0....1..0..0..0..0..0..0....1..0..0..0..0..0..0
..0..0..0..0..0..0..0....2..2..0..0..0..0..0....0..0..0..0..0..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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