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A267547
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Number of 4Xn arrays containing n copies of 0..4-1 with no element 1 greater than its north, west or southeast neighbor modulo 4 and the upper left element equal to 0.
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1
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2, 27, 255, 3527, 51759, 852932, 14954188, 273141379, 5179064643, 100829282975, 2002465966258, 40428770929803, 827090165579327, 17105221165373796, 357027788626167770, 7510894690703464379, 159088048372227390425
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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..3..2..2....0..2..1..3....0..2..1..0....0..0..2..1....0..2..0..2
..3..1..0..2....3..1..0..2....2..1..3..3....3..2..1..3....3..1..0..2
..1..0..3..2....3..3..2..1....2..0..3..1....1..1..0..3....3..3..2..1
..0..3..1..1....2..1..0..0....0..3..2..1....0..3..2..2....1..1..0..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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