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A186586
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Number of (n+3)X9 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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1728546, 79015, 149305, 328891, 626233, 811795, 823249, 841075, 880969, 1019683, 1221265, 1504507, 2353993, 3537235, 4869121, 7110411, 10563977, 14962483, 20061441, 27545691, 39153465, 55017603, 74946417, 104128395, 148464553
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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>16
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EXAMPLE
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Some solutions for 5X9
..0..0..0..0..0..0..0..2..0....0..0..0..0..0..0..2..0..1
..0..0..0..0..0..0..0..0..1....0..0..0..0..0..0..0..0..2
..2..0..0..0..0..0..0..0..2....1..0..0..0..0..0..0..0..0
..1..0..0..0..0..0..0..0..0....0..1..0..0..0..0..0..0..0
..1..1..0..0..0..0..0..0..0....2..0..1..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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