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A222157
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Number of nX5 arrays with each row a permutation of 1..5 having at least as many downsteps as the preceding row, with rows in lexicographically nondecreasing order
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1
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120, 6322, 207262, 4907711, 91075868, 1393742886, 18203084280, 207961261268, 2116883443548, 19475385665260, 163788555854232, 1270883781907016, 9168186853827174, 61890082396969113, 393107547309424404
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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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See link for formula
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EXAMPLE
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Some solutions for n=3
..2..3..5..1..4....1..2..5..3..4....1..5..2..3..4....3..4..2..1..5
..5..1..2..4..3....3..5..1..4..2....3..5..2..1..4....5..3..2..1..4
..5..1..3..4..2....5..2..3..4..1....4..3..2..5..1....5..4..2..1..3
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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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