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A238319
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Number of (n+1) X (4+1) 0..2 arrays with no element greater than all horizontal neighbors or less than all vertical neighbors.
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1
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51, 1867, 41046, 721939, 13265123, 261676376, 5206684654, 102053610873, 1987295524193, 38770223731701, 758012281434166, 14822685184195262, 289709710098420174, 5661329642092072222, 110637907561833470425
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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
..1..2..2..2..2....2..2..2..1..1....1..2..2..2..1....1..1..1..0..0
..0..0..0..0..0....0..2..2..1..0....0..1..1..1..1....1..1..0..0..0
..0..0..0..0..0....0..0..1..1..0....0..1..1..1..1....1..1..0..0..0
..0..0..0..2..2....0..0..1..1..0....0..2..2..2..1....1..2..2..1..0
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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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