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A088953 Number of numbers that are ternary squarefree words of length n. 1
1, 3, 4, 8, 12, 20, 28, 40, 52, 72, 96, 136, 176, 228, 304, 412, 532, 696, 928, 1220, 1592, 2120, 2764, 3612, 4688, 6132, 7928, 10324, 13480, 17616, 22948, 29908, 38964, 50748, 66184, 86344, 112364, 146344, 190500 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

a(n) = A006156(a(n))*2/3 for n>1.

LINKS

Table of n, a(n) for n=0..38.

Eric Weisstein's World of Mathematics, Squarefree Word

CROSSREFS

Cf. A088952, A007089.

Sequence in context: A229990 A147620 A195746 * A281612 A025034 A145722

Adjacent sequences:  A088950 A088951 A088952 * A088954 A088955 A088956

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Oct 25 2003

STATUS

approved

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Last modified April 3 19:43 EDT 2020. Contains 333198 sequences. (Running on oeis4.)