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A215071 Number of squarefree words of length n in a 5-ary alphabet, with new values 0..4 introduced in increasing order 0
1, 1, 2, 4, 12, 39, 138, 503, 1864, 6936, 25868, 96512, 360203, 1344408, 5018051, 18729944, 69910398, 260943079, 973980990, 3635421345, 13569354266, 50648137765, 189046143161 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Column 4 of A215075

LINKS

Table of n, a(n) for n=1..23.

EXAMPLE

Some solutions for n=6

..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0

..1....1....1....1....1....1....1....1....1....1....1....1....1....1....1....1

..2....2....2....2....0....2....2....2....0....2....2....0....2....2....0....2

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

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

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

CROSSREFS

Sequence in context: A108532 A213058 A268069 * A180487 A000940 A008404

Adjacent sequences:  A215068 A215069 A215070 * A215072 A215073 A215074

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 02 2012

STATUS

approved

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Last modified March 2 06:37 EST 2021. Contains 341744 sequences. (Running on oeis4.)