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A266834
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Number of 4Xn arrays containing n copies of 0..4-1 with no element 1 greater than its north, west or northwest neighbor modulo 4 and the upper left element equal to 0.
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1
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2, 11, 95, 1267, 19605, 322100, 5798969, 109094449, 2137890119, 42723425901, 870452405353, 17947494617157, 374336019053969, 7871123322669134, 166752702383416172, 3553681134317844777, 76147251272709529075
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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..3..1..3..1....0..3..2..0..3....0..0..0..0..2....0..2..0..3..3
..0..2..1..1..1....2..2..1..0..3....3..3..2..2..2....0..2..2..2..1
..3..2..0..0..3....2..1..1..0..3....3..3..1..1..1....3..2..1..0..0
..2..2..2..0..3....2..1..1..0..3....2..1..1..0..3....1..1..1..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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