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A221307
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Number of nX5 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, with every occupancy equal to zero or two
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0
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0, 90, 0, 38146, 0, 19642342, 0, 9842336697, 0, 4907450696408, 0, 2441328266555768, 0, 1213489893520857350, 0, 602992641919618581949, 0, 299597420150822374508346, 0, 148848899893861061853934856, 0
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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=4
..0..0..0..2..2....0..2..0..0..0....0..0..2..0..0....2..2..0..2..0
..2..2..0..0..0....0..2..0..2..0....2..2..2..2..0....0..0..0..2..2
..0..0..2..2..0....2..2..2..2..0....0..0..0..2..2....0..0..0..0..2
..2..2..2..2..0....0..2..0..2..2....0..2..2..0..2....2..2..2..2..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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