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A051043 Number of quaternary cubefree words of length n. 1
4, 16, 60, 228, 864, 3264, 12336, 46632, 176208, 665892, 2516412, 9509364, 35935476, 135798588, 513176076 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..14.

Eric Weisstein's World of Mathematics, Cubefree Word.

CROSSREFS

Cf. A028445, A051042.

Sequence in context: A032106 A269462 A047097 * A123620 A234008 A203153

Adjacent sequences:  A051040 A051041 A051042 * A051044 A051045 A051046

KEYWORD

nonn

AUTHOR

Eric W. Weisstein

EXTENSIONS

More terms from Sascha Kurz, Mar 22 2002

STATUS

approved

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Last modified January 16 06:59 EST 2019. Contains 319188 sequences. (Running on oeis4.)