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A221116
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Number of 4Xn arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without 2-loops
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1
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0, 0, 51, 3706, 189762, 9107191, 423897591, 19542896293, 896843573267, 41075163197254, 1879441716510988, 85958060741822727, 3930554451621004497, 179712606810281833146, 8216432506372052839604, 375645902985042283582854
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OFFSET
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1,3
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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..2..0....0..1..1....0..2..0....0..2..0....0..2..1....0..1..1....0..2..1
..1..2..1....0..3..1....1..1..0....1..2..1....1..3..0....0..3..0....1..3..1
..1..2..0....1..2..0....1..3..1....1..3..1....1..1..0....1..2..1....0..1..0
..1..2..0....1..2..0....1..2..0....0..1..0....1..2..0....1..2..0....1..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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