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A266657
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Number of 4Xn arrays containing n copies of 0..4-1 with no element 1 greater than its northeast neighbor modulo 4 and the upper left element equal to 0.
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1
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6, 234, 14540, 1044230, 81918724, 6799306012, 587026055968, 52178873655200, 4743093016860180, 438882927135198876, 41201333430973995312, 3914496456510827388928, 375684251811756396598000
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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
..0..2..3....0..3..3....0..3..2....0..1..3....0..2..3....0..1..3....0..3..3
..0..3..0....2..2..0....1..2..1....1..3..3....0..3..3....3..1..0....1..1..0
..1..3..2....0..3..1....2..0..3....1..2..2....1..2..1....0..2..3....1..0..2
..1..1..2....2..1..1....3..1..0....2..0..0....0..1..2....2..1..2....2..2..3
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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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