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A221353
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Number of 3Xn arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without 2-loops
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0
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0, 7, 370, 12296, 364868, 10612940, 304064432, 8672312531, 246687608692, 7009800248655, 199081627533706, 5652690459992416, 160483388497482942, 4555988975443640203
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OFFSET
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1,2
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=3
..0..3..0....0..3..0....0..0..0....0..1..0....0..2..0....0..0..0....1..3..0
..2..1..1....2..1..0....2..5..1....1..3..1....2..2..0....1..3..2....1..3..1
..0..2..0....0..2..1....0..1..0....0..2..1....1..2..0....0..3..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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