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A266293
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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 northeast neighbor modulo 4 and the upper left element equal to 0.
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1
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2, 9, 91, 1233, 18827, 323444, 5826961, 110866391, 2163054304, 43343013317, 881391937160, 18187248704334, 378905566162207, 7966181836169943, 168631785538687281, 3592456489311716500, 76933383114445494985
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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..0..3..1..3....0..3..2..2..1....0..0..3..3..1....0..2..0..3..3
..2..2..1..1..1....2..2..2..1..1....2..2..2..1..1....0..2..2..1..3
..0..0..3..3..3....1..0..0..3..3....1..0..0..0..3....2..1..0..3..1
..0..2..2..2..1....0..0..3..3..1....3..3..2..2..1....1..0..2..1..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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