A088953 - OEIS

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A088953

Number of numbers that are ternary squarefree words of length n.

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`
	LINKS	`Table of n, a(n) for n=0..38.` `Eric Weisstein's World of Mathematics, Squarefree Word`
	FORMULA	`a(n) = A006156(n)*2/3 for n>1 [Corrected by Rémy Sigrist, Aug 19 2020].`
	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 January 19 18:48 EST 2021. Contains 340270 sequences. (Running on oeis4.)