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A253994
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Number of (2+2)X(n+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, 68176, 350496, 1738927, 8730836, 43840181, 217514688, 1076487005, 5316416857, 26147742882, 128223160536, 627281505519, 3061322367965, 14907228497301, 72450268687501, 351477169523845, 1702262412004744
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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..0..0....1..0..0..1..1....0..0..0..0..1....1..0..0..0..1
..0..0..0..1..1....1..1..1..1..1....1..0..1..0..1....0..0..1..0..1
..1..0..0..1..0....1..1..0..1..1....0..0..1..1..1....1..0..0..0..1
..1..1..1..1..0....1..1..1..1..0....0..0..1..1..0....0..1..0..1..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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