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A252929
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Number of nX7 nonnegative integer arrays with upper left 0 and lower right n+7-6 and value increasing by 0 or 1 with every step right or down
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2
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15, 483, 13976, 315198, 5385305, 71297441, 759337545, 6725497344, 50869309436, 335549742230, 1963313662947, 10332594393296, 49485574097413, 217813226273441, 888570804281664, 3384240524056852, 12109669540486657
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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 polynomial of degree 28 (see link above)
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EXAMPLE
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Some solutions for n=3
..0..1..1..1..1..2..3....0..1..1..2..3..3..4....0..1..2..2..3..3..4
..1..1..1..2..2..3..3....1..2..2..2..3..3..4....0..1..2..2..3..3..4
..2..2..2..2..3..4..4....2..2..2..3..3..3..4....1..2..2..2..3..3..4
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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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