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A183360
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One quarter the number of nX8 1..4 arrays with no two neighbors of any element equal to each other
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1
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2916, 147456, 104976, 166464, 331776, 746496, 1806336, 4460544, 9437184, 19501056, 40144896, 84934656, 180633600, 391090176, 840536064, 1816805376, 3893760000, 8387629056, 17960288256, 38654705664, 82833444864, 178259595264
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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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EXAMPLE
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Some solutions for 5X8 with a(1,1)=1
..1..2..2..3..1..2..2..1....1..2..4..4..1..2..4..4....1..3..4..1..2..2..4..3
..1..3..4..4..1..3..4..4....1..3..3..2..1..3..3..2....2..2..4..1..3..3..4..1
..4..3..1..2..2..3..1..2....4..4..1..2..4..4..1..2....4..1..3..2..4..1..2..2
..2..2..1..3..4..4..1..2....2..2..1..3..3..2..1..3....4..1..3..2..4..1..3..3
..3..4..4..3..1..2..3..4....3..3..4..4..1..2..4..4....2..2..4..1..3..2..4..1
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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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