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A196681
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Number of n X 4 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,0,1,2,3 for x=0,1,2,3,4.
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1
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5, 61, 292, 2245, 15395, 109528, 796557, 5702355, 40479328, 289195575, 2074543871, 14876511544, 106491873717, 761738952927, 5453371319038, 39065425553179, 279802106777205, 2003379491308618, 14343725864416775, 102713433223681069
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OFFSET
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1,1
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COMMENTS
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Every 0 is next to 0 4's, every 1 is next to 1 0's, every 2 is next to 2 1's, every 3 is next to 3 2's, every 4 is next to 4 3's.
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LINKS
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EXAMPLE
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Some solutions for n=5
..0..2..1..2....1..0..0..1....1..1..0..0....0..0..1..2....0..0..1..1
..1..1..0..1....1..0..0..1....0..1..2..0....0..0..1..1....1..1..1..0
..2..2..0..1....2..0..2..1....1..1..1..1....1..1..2..0....1..1..1..2
..1..1..0..1....1..2..1..0....1..0..0..1....2..1..0..0....0..0..0..1
..0..2..1..2....0..0..1..1....2..1..1..2....0..2..1..1....1..1..1..2
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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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