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A253987
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Number of (n+2)X(2+2) 0..1 arrays with every 3X3 subblock diagonal median plus antidiagonal median nondecreasing horizontally, vertically and ne-to-sw antidiagonally
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1
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2736, 13188, 71116, 406183, 2136758, 11055001, 57285940, 292920515, 1484002479, 7476194054, 37444501224, 186551627339, 925459276687, 4573566632656, 22524344983871, 110592854608614, 541521269124949, 2645012332922518
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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
..0..0..0..1....1..0..0..1....0..0..1..1....1..0..0..1....0..1..0..0
..1..0..0..0....1..0..0..1....1..1..0..1....1..0..0..1....0..0..0..1
..0..0..0..1....0..1..1..1....1..1..0..1....0..0..0..0....0..1..1..0
..1..0..0..0....1..1..1..1....1..1..1..1....1..0..0..1....0..1..1..0
..1..0..1..0....1..1..1..0....1..0..1..0....0..0..1..0....0..0..0..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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