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A267202
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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 north, southwest or northwest neighbors modulo 4 and the upper left element equal to 0.
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1
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1, 0, 0, 1, 5, 23, 79, 178, 336, 835, 3128, 14040, 59621, 222502, 738006, 2300988, 7269138, 24626806, 89676159, 336858214, 1251319303, 4507801679, 15792191315, 54688767852, 190846159644, 679049839287, 2461345925310, 8998778045264
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OFFSET
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1,5
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=8
..0..1..2..2..3..3..0..0....0..1..2..2..3..3..0..0....0..1..1..2..2..3..3..0
..1..1..2..2..3..3..0..0....0..1..2..2..3..3..0..0....1..1..2..2..3..3..0..0
..1..1..2..2..3..3..0..0....1..1..2..2..3..3..0..1....1..2..2..3..3..0..0..1
..1..1..2..2..3..3..0..1....1..1..2..2..3..3..0..1....2..2..3..3..0..0..1..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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