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A248837 Number of length n arrays x(i), i=1..n with x(i) in 0..i and no value appearing more than 3 times 3
2, 6, 24, 118, 686, 4598, 34872, 295044, 2753958, 28103804, 311216626, 3716341042, 47597786154, 650812077852, 9461423560788, 145724617925326, 2370293673319292, 40600119927220706, 730458115445479734, 13772063820971722638 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A248842.

Essentially the same as A135106. - Georg Fischer, Oct 23 2018

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

EXAMPLE

Some solutions for n=6

..0....1....0....1....0....0....1....1....1....0....0....0....0....0....0....1

..2....1....0....2....1....1....1....1....1....1....1....0....0....0....1....1

..2....0....0....0....1....1....2....2....0....3....0....2....3....3....2....2

..1....0....3....0....0....1....4....4....1....0....1....1....2....4....4....1

..5....0....2....2....3....4....5....2....2....4....4....0....1....0....5....5

..3....5....3....1....5....2....5....2....5....0....2....5....0....2....0....6

CROSSREFS

Sequence in context: A328501 A328442 A135106 * A005394 A095818 A264781

Adjacent sequences: A248834 A248835 A248836 * A248838 A248839 A248840

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 15 2014

STATUS

approved

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Last modified December 4 08:59 EST 2022. Contains 358552 sequences. (Running on oeis4.)