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A267837
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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 northeast neighbor modulo 4 and the upper left element equal to 0.
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1
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6, 54, 924, 19696, 456052, 11169884, 284749896, 7478180356, 200946163564, 5498658652872, 152701830225328, 4292791741022352, 121927662325745128, 3493616278749683152, 100864166949775322480, 2931337070411050352250
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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=4
..0..1..2..1....0..2..1..1....0..2..3..1....0..0..1..1....0..3..1..3
..2..3..1..3....2..1..2..3....3..3..1..0....0..1..1..2....0..2..3..1
..0..2..3..0....1..2..0..3....3..2..0..0....2..2..3..3....3..0..1..2
..3..0..1..2....3..0..0..3....2..1..1..2....2..3..3..0....0..2..2..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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