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A186585
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Number of (n+3)X8 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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805791, 42313, 115699, 293665, 569947, 626233, 635779, 645937, 662467, 701065, 850195, 1094737, 1785355, 2632681, 4196451, 5971361, 8671483, 11762217, 16584099, 22317345, 31282251, 42723033, 60753651, 84156817, 119423547
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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>15
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EXAMPLE
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Some solutions for 5X8
..0..0..0..0..0..1..2..0....0..0..0..0..0..0..2..0....0..0..0..0..0..0..0..2
..0..0..0..0..0..0..0..0....0..0..0..0..0..0..0..1....0..0..0..0..0..0..0..2
..1..0..0..0..0..0..0..0....0..0..0..0..0..0..0..1....0..0..0..0..0..0..0..0
..1..0..0..0..0..0..0..0....0..2..0..0..0..0..0..0....0..0..0..0..0..0..0..0
..1..0..0..0..0..0..0..1....0..1..0..0..0..0..0..0....2..1..1..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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