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A214940 Number of squarefree words of length n in a 6-ary alphabet 0
6, 30, 150, 720, 3480, 16680, 80040, 383520, 1838160, 8807400, 42202560, 202209720, 968880960, 4642304520, 22243228680, 106576361760, 510651000360 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A214943

LINKS

Table of n, a(n) for n=1..17.

EXAMPLE

Some solutions for n=6

..4....4....4....1....5....5....4....5....2....1....5....4....2....1....4....5

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

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

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

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

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

CROSSREFS

Sequence in context: A079738 A127741 A073965 * A002913 A157519 A075886

Adjacent sequences:  A214937 A214938 A214939 * A214941 A214942 A214943

KEYWORD

nonn

AUTHOR

R. H. Hardin Jul 30 2012

STATUS

approved

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Last modified August 8 23:02 EDT 2020. Contains 336300 sequences. (Running on oeis4.)