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A266601
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Number of 4Xn arrays containing n copies of 0..4-1 with no element 1 greater than its north or northeast neighbor modulo 4 and the upper left element equal to 0.
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1
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2, 38, 964, 30637, 1073367, 39966856, 1551883779, 62152155338, 2549025811419, 106526379738263, 4520170915107051, 194230279053023377, 8434658244488956260, 369593817153717655945, 16321035858001412664324, 725605378261164051062577
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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..1..3....0..1..0..3....0..3..1..0....0..0..2..3....0..1..0..2
..3..0..1..2....3..3..3..2....3..3..3..2....0..0..2..1....0..3..0..2
..2..0..0..1....2..2..1..1....1..1..2..2....3..2..1..3....3..3..2..2
..2..2..3..3....2..1..0..0....0..0..1..2....1..1..3..2....3..1..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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