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A267397
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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, west or northeast neighbors modulo 4 and the upper left element equal to 0.
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1
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1, 2, 5, 12, 36, 127, 491, 1975, 7870, 31298, 124276, 500855, 2061014, 8699937, 37534533, 164436255, 725855629, 3210406564, 14185263492, 62597467436, 276260201275, 1221933146012, 5426950430555, 24226437430604, 108701332822518
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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=4
..0..0..0..1....0..0..0..1....0..1..1..1....0..0..1..1....0..0..1..2
..0..1..1..2....1..1..1..2....1..2..2..2....0..1..2..2....1..1..2..3
..1..2..2..3....2..2..2..3....2..3..3..3....1..2..3..3....1..2..3..3
..2..3..3..3....3..3..3..0....3..0..0..0....2..3..3..0....2..3..0..0
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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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