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A253741
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Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock ne-sw antidiagonal difference nondecreasing horizontally and nw+se diagonal sum nondecreasing vertically
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1
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81, 2723, 77414, 1143174, 10966149, 64166071, 333213583, 1343634212, 4751131685, 14311629354, 39554854483, 98216242368, 227147255700, 487878952466, 998933350773, 1939409904324, 3619796162567, 6491024508035, 11307537178352
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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..0..0..0....2..1..1..2....2..0..1..2....0..0..1..2....0..0..0..0
..1..0..0..0....2..0..0..0....0..0..1..1....0..1..1..2....2..0..0..1
..2..0..0..0....2..1..1..2....2..2..2..2....2..2..2..2....1..0..1..1
..2..1..0..0....2..2..2..1....0..0..0..1....2..1..1..2....2..1..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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