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A221232
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Number of nX4 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, with no occupancy greater than 2
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1
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4, 852, 54075, 3618339, 245539157, 16783348483, 1149649557942, 78781028973610, 5398115263510454, 369826510764450212, 25333832048380716784, 1735268265292767301022, 118852327360929428638771
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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 n=3
..1..0..0..1....1..1..2..0....1..1..2..1....1..2..1..0....2..0..1..2
..2..1..1..2....2..1..0..2....0..2..1..0....1..0..2..1....1..0..1..2
..1..2..0..1....0..0..2..1....0..1..1..2....0..2..2..0....1..2..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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