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A237407
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Number of (n+1) X (3+1) 0..2 arrays with the maximum plus the upper median plus the minimum of every 2 X 2 subblock differing from its horizontal and vertical neighbors by exactly one.
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1
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1278, 8236, 53167, 373804, 2671962, 18401364, 125750824, 872440876, 6089994150, 42113161848, 291069201134, 2016256423968, 14003302227390, 96905004811952, 671377683662330, 4648755970028064, 32248931393362930, 223222561428051576
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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=3
..2..0..0..2....2..1..0..0....0..0..0..0....2..2..2..2....0..2..1..1
..2..1..2..1....1..0..1..2....0..1..1..2....0..1..2..2....1..1..1..1
..0..1..1..0....2..2..0..2....1..0..2..0....2..1..1..2....1..2..0..0
..0..1..1..0....1..2..1..1....0..2..1..0....1..1..1..1....0..1..2..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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