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A235408
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Number of (n+1)X(3+1) 0..1 arrays with 2X2 subblock sums lexicographically nondecreasing rowwise and nonincreasing columnwise
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1
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121, 704, 4256, 20398, 98575, 397340, 1623115, 5744912, 20612708, 65877470, 213190201, 627225413, 1867007833, 5131067959, 14261504547, 37041121138, 97280493869, 241057367009, 603912355679, 1438964930953, 3465601783227
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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 73 (see link above)
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EXAMPLE
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Some solutions for n=4
..1..0..0..0....0..1..0..1....0..1..0..1....1..0..0..1....1..0..0..0
..0..1..0..0....1..0..1..0....1..1..0..1....1..1..1..0....0..0..0..0
..1..0..1..0....1..1..0..1....0..1..1..0....1..0..1..1....0..1..0..1
..0..1..0..0....1..0..1..0....1..1..0..1....1..1..1..0....1..0..1..0
..1..1..1..0....1..1..1..0....1..1..1..1....0..1..1..0....0..1..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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