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A267630
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Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to or 1 greater than any west neighbor modulo 4 and the upper left element equal to 0.
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1
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6, 27, 208, 2386, 32208, 445970, 6039160, 80742586, 1086798652, 14898269746, 208430268352, 2964609577834, 42639468240764, 617605254789776, 8990677585470960, 131473208822453124, 1931423573382740480
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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
..0..1..1..2....0..0..0..0....0..0..1..1....0..1..2..2....0..0..0..1
..3..3..3..0....1..1..2..2....2..3..0..1....0..1..2..3....0..1..1..2
..0..0..1..2....1..1..2..2....2..2..3..3....3..0..1..2....1..2..3..3
..1..2..2..3....3..3..3..3....0..1..2..3....3..3..0..1....2..2..3..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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