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A266888
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Number of 4 X n arrays containing n copies of 0..4-1 with no element 1 greater than its north, northeast or northwest neighbor modulo 4 and the upper left element equal to 0.
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1
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2, 22, 322, 5826, 116602, 2507350, 56777970, 1336707816, 32440959218, 806165939746, 20420782541546, 525394022266716, 13694383648911264, 360867862158985262, 9598740400829938584, 257384054278121562390
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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..1..0..3..3....0..0..0..3..1....0..1..1..2..1....0..3..0..3..1
..3..0..3..2..3....2..2..2..3..3....0..0..1..0..0....2..3..2..3..3
..2..2..2..2..1....1..2..2..1..3....2..3..3..3..3....2..1..1..2..2
..0..1..0..1..1....0..1..0..1..3....2..2..3..2..1....0..1..0..0..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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