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A093305 Number of binary necklaces of length n with no subsequence 000. 0
1, 2, 3, 4, 5, 9, 11, 19, 29, 48, 75, 132, 213, 369, 627, 1083, 1857, 3244, 5619, 9844, 17205, 30229, 53115, 93701, 165313, 292464, 517831, 918578, 1630933, 2900109, 5161443, 9197251, 16402841, 29283026, 52319379, 93558968, 167427845 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

FORMULA

a(n) = (1/n)* sum_{d divides n } totient(n/d)*A001644(d).

CROSSREFS

Sequence in context: A143827 A100797 A139441 * A065817 A084542 A038201

Adjacent sequences:  A093302 A093303 A093304 * A093306 A093307 A093308

KEYWORD

easy,nonn

AUTHOR

DELEHAM Philippe (kolotoko(AT)wanadoo.fr), Apr 24 2004

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Last modified February 17 03:45 EST 2012. Contains 205978 sequences.