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A266574
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Number of 4Xn arrays containing n copies of 0..4-1 with no element 1 greater than its northwest or southwest neighbor modulo 4 and the upper left element equal to 0.
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1
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6, 74, 2320, 77830, 2595190, 94930586, 3708826784, 148879349035, 6098536482216, 255081230000786, 10848711502940592, 467125765450160196, 20321101379722519804, 892020118445773622883, 39459836156094190716464
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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..3..1....0..0..1..2....0..1..2..1....0..2..3..3....0..2..3..3
..1..3..3..1....2..2..0..3....3..0..3..2....0..3..0..1....2..0..1..1
..0..0..2..2....2..1..1..3....0..1..2..3....1..2..3..0....2..2..3..0
..2..2..3..0....3..1..0..3....3..0..1..2....2..1..1..2....0..1..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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