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A266855
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Number of 4Xn arrays containing n copies of 0..4-1 with no element 1 greater than its north, west, northeast or southeast neighbor modulo 4 and the upper left element equal to 0.
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1
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2, 6, 44, 438, 4156, 49033, 588632, 8351513, 113609298, 1770032098, 26096782411, 426735882363, 6595598937191, 110427559297288, 1759795259815468, 29843750451187538, 485812231474336419, 8302508424244712407
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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=5
..0..2..1..1..3....0..3..2..0..2....0..2..1..0..3....0..2..1..3..1
..2..0..3..3..1....2..1..0..0..2....2..0..3..3..1....2..0..3..1..3
..0..3..2..1..1....0..3..3..2..1....0..3..2..1..1....0..2..1..3..2
..2..2..0..0..3....3..1..1..1..3....2..2..1..0..3....0..0..3..2..1
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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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