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A207224
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Number of nX4 0..2 arrays avoiding the patterns z z+1 z or z z-1 z in any row, column or nw-se diagonal
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1
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61, 3721, 100997, 3447649, 115679881, 3814387801, 125372637881, 4126073501121, 135963448993769, 4480839360430545, 147644379170646697, 4864581400227966369, 160280548163611896153, 5281079669610169252337, 174006141329285345485257
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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=4
..1..0..2..0....2..0..2..1....2..2..1..0....0..2..2..2....2..2..2..1
..1..0..0..0....1..1..1..0....2..1..0..0....1..1..0..2....2..1..0..2
..2..1..0..0....0..1..1..2....1..1..0..0....2..0..1..1....2..0..0..2
..2..1..0..0....0..0..0..2....0..1..1..2....2..2..2..0....1..0..2..2
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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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