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A248840
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Number of length n arrays x(i), i=1..n with x(i) in 0..i and no value appearing more than 6 times
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1
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2, 6, 24, 120, 720, 5040, 40318, 362804, 3626872, 39874764, 478139586, 6209677488, 86828161058, 1300490408860, 20771844841954, 352424863147204, 6329638315606052, 119970031702245396, 2393022889885984816
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OFFSET
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1,1
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COMMENTS
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Column 6 of A248842
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LINKS
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R. H. Hardin, Table of n, a(n) for n = 1..109
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EXAMPLE
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Some solutions for n=6
..0....0....0....0....1....1....0....1....0....1....0....0....1....0....0....0
..1....1....1....1....1....0....0....0....2....0....1....1....1....2....0....1
..1....1....3....3....0....1....2....3....1....0....1....1....0....0....2....3
..0....2....2....1....2....0....2....1....0....4....2....1....2....3....3....4
..1....2....0....2....5....1....5....2....0....1....4....3....0....5....4....1
..2....0....6....3....2....0....1....4....4....2....6....4....3....5....4....3
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CROSSREFS
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Sequence in context: A152381 A152385 A226439 * A072131 A230051 A067455
Adjacent sequences: A248837 A248838 A248839 * A248841 A248842 A248843
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin, Oct 15 2014
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STATUS
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approved
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