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A251968
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Number of (n+1) X (n+1) 0..3 arrays with nondecreasing sum of every two consecutive values in every row and column.
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1
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256, 20000, 6250000, 1500625000, 922368160000, 410018473428480, 371968759094317056, 244967687215822061568, 286806250077948918890496, 248333886971163312349814784, 348300471444720308054703841536
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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=2
..3..2..3....1..0..2....1..0..1....2..1..2....1..0..2....1..0..1....0..0..1
..0..1..0....0..1..3....3..0..3....2..1..3....1..1..1....2..2..3....0..3..1
..3..2..3....1..3..3....1..3..1....3..3..3....3..3..3....3..1..3....2..3..2
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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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