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A248840 Number of length n arrays x(i), i=1..n with x(i) in 0..i and no value appearing more than 6 times 1
2, 6, 24, 120, 720, 5040, 40318, 362804, 3626872, 39874764, 478139586, 6209677488, 86828161058, 1300490408860, 20771844841954, 352424863147204, 6329638315606052, 119970031702245396, 2393022889885984816 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A248842

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..109

EXAMPLE

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

CROSSREFS

Sequence in context: A152381 A152385 A226439 * A072131 A230051 A067455

Adjacent sequences: A248837 A248838 A248839 * A248841 A248842 A248843

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 15 2014

STATUS

approved

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Last modified January 28 01:36 EST 2023. Contains 359849 sequences. (Running on oeis4.)