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A235769
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Number of (n+1) X (4+1) 0..1 arrays with the sum of each 2 X 2 subblock two extreme terms minus its two median terms lexicographically nondecreasing columnwise and nonincreasing rowwise.
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1
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288, 1948, 12417, 70752, 377890, 1874171, 8783904, 38884279, 163704284, 657363226, 2525936111, 9324137986, 33129297593, 113732864597, 377785457375, 1218228779121, 3817997272627, 11661674918706, 34748345374833
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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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FORMULA
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Empirical recurrence of order 88 (see link above).
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EXAMPLE
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Some solutions for n=4
..0..0..1..0..1....0..0..1..0..0....1..0..0..1..0....0..1..0..0..0
..1..1..0..0..0....1..1..0..1..0....0..1..0..0..0....1..0..1..0..1
..1..1..0..0..1....0..1..0..0..1....1..1..0..0..0....1..0..1..1..0
..1..0..1..1..0....1..1..1..1..1....1..0..1..1..1....0..1..0..1..1
..1..1..0..1..1....0..1..0..1..0....1..1..1..0..0....1..1..0..0..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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