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A266869
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Number of 4Xn arrays containing n copies of 0..4-1 with no element 1 greater than its west or northeast neighbor modulo 4 and the upper left element equal to 0.
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1
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6, 72, 1304, 31501, 843874, 24244702, 728850883, 22663306978, 723210750621, 23536767146485, 778080992727147, 26055452315387786, 881920582298144042, 30122404974018012719, 1036868581470252969758, 35932758405637296245430
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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..0..2..0....0..3..2..2....0..3..1..1....0..2..0..0....0..0..2..0
..2..1..3..2....3..2..1..3....2..1..3..2....1..3..2..1....2..0..3..3
..1..1..1..0....1..1..1..0....3..2..2..0....3..2..1..1....2..1..3..2
..3..3..3..2....0..3..2..0....0..0..3..1....2..0..3..3....1..3..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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