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A214939 Number of squarefree words of length n in a 5-ary alphabet 0
5, 20, 80, 300, 1140, 4260, 15960, 59580, 222600, 830880, 3102120, 11578800, 43220940, 161324400, 602159940, 2247585300, 8389237320, 31313155560, 116877700500, 436250537520 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A214943

LINKS

Table of n, a(n) for n=1..20.

EXAMPLE

Some solutions for n=6

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

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

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

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

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

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

CROSSREFS

Sequence in context: A275907 A117422 A154639 * A162925 A163316 A163878

Adjacent sequences:  A214936 A214937 A214938 * A214940 A214941 A214942

KEYWORD

nonn

AUTHOR

R. H. Hardin Jul 30 2012

STATUS

approved

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Last modified August 12 12:01 EDT 2020. Contains 336439 sequences. (Running on oeis4.)