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A094538 Number of ternary words of length n that are not "bifix-free". 1
0, 0, 3, 9, 33, 99, 315, 945, 2883, 8649, 26091, 78273, 235233, 705699, 2118339, 6355017, 19068729, 57206187, 171629595, 514888785, 1544699313, 4634097939, 13902392691, 41707178073, 125121830427, 375365491281 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..25.

FORMULA

Equals 3^n - A019308(n).

CROSSREFS

See A019308 and A003000 for much more information. Cf. A094539.

Sequence in context: A284964 A281973 A219557 * A037129 A148987 A176812

Adjacent sequences:  A094535 A094536 A094537 * A094539 A094540 A094541

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, Jun 06 2004

STATUS

approved

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Last modified November 21 16:04 EST 2019. Contains 329371 sequences. (Running on oeis4.)