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Search: id:A092668
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| 1, 2, 4, 9, 23, 63, 190, 612, 2056, 7155, 25482, 92205, 337594, 1246863, 4636390, 17334801, 65108062, 245492244, 928772650, 3524337980, 13409202676, 51141124287, 195470831356, 748607855769, 2872202028517, 11038251159312
(list; graph; listen)
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OFFSET
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0,2
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MAPLE
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with(numtheory): b:= proc(n) local s, d; if n = 0 then RETURN(1) else s := 2^(floor(n/2)); for d in divisors(n) do s := s+(phi(2*d)*2^(n/d))/(2*n); od; RETURN(s/2); fi; end: seq(b(2*n-1), n=1..30); - Emeric Deutsch (deutsch(AT)duke.poly.edu), Feb 13 2006
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CROSSREFS
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Cf. A000011, A000117.
Sequence in context: A001573 A135307 A000083 this_sequence A164039 A014137 A007476
Adjacent sequences: A092665 A092666 A092667 this_sequence A092669 A092670 A092671
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Nov 24 2004
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EXTENSIONS
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More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Feb 13 2006
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