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A267265
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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, northeast or northwest neighbors modulo 4 and the upper left element equal to 0.
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1
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1, 1, 1, 1, 1, 1, 1, 9, 87, 865, 7649, 61021, 458527, 3292439, 22907789, 155639305, 1038112235, 6824466823, 44346420219, 285480376511, 1823828784941, 11579358641469, 73141158203461, 460054937791477, 2883707639144059
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OFFSET
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1,8
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=12
..0..1..1..2..2..2..3..2..3..3..0..0....0..0..3..0..0..1..1..2..2..2..2..1
..1..1..2..2..2..3..3..3..3..0..0..1....0..0..0..0..1..1..2..2..3..3..2..2
..1..2..2..2..3..3..0..0..0..0..1..1....1..0..0..1..1..2..2..3..3..3..3..3
..2..2..3..3..3..0..0..1..0..1..1..1....1..1..1..1..2..2..3..3..3..0..0..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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