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A237917
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Number of (n+1)X(3+1) 0..3 arrays with the upper median plus the lower median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one
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1
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9892, 133528, 1907520, 27873820, 405401852, 5873296416, 85701783182, 1241851571792, 18123171520244, 262625441797028, 3832538191826204, 55537509416257192, 810520201764017682, 11745382355662024760
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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=2
..0..3..0..2....1..0..2..0....1..2..0..0....2..1..3..2....2..0..1..2
..3..0..2..1....3..2..3..3....0..0..3..1....1..0..2..1....0..2..2..3
..3..1..2..2....2..0..3..1....0..0..1..0....0..3..0..3....3..1..3..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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