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A268120
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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 or west neighbors modulo 4 and the upper left element equal to 0.
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1
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1, 2, 5, 25, 182, 1256, 7396, 39891, 210384, 1168317, 7080023, 45942141, 304138329, 1984289501, 12627984625, 79001714951, 493690545161, 3127108593615, 20194195021000, 132397182653318, 873218912983165, 5749093679423621
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OFFSET
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1,2
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=6
..0..0..1..2..3..3....0..1..2..3..3..0....0..0..1..1..2..3....0..0..1..2..3..3
..1..1..2..2..3..0....0..1..2..3..3..0....0..1..1..2..3..3....1..1..2..3..3..0
..1..2..3..3..0..0....1..1..2..3..0..1....1..2..2..3..0..0....1..2..2..3..0..0
..2..2..3..0..1..1....2..2..2..3..0..1....2..2..3..3..0..1....2..2..3..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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