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A081729
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Expansion of Sum(k>=0, x^(2^k)) + 1/(1+x). First differences of A007456 (gossip sequence) for n>1.
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2
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1, 0, 2, -1, 2, -1, 1, -1, 2, -1, 1, -1, 1, -1, 1, -1, 2, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 2, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 2, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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COMMENTS
| For n>1: a(n)=2, if n is power of 2; a(n)=-1, if n odd; a(n)=1 otherwise.
Contribution from Johannes W. Meijer (meijgia(AT)hotmail.com), May 24 2009: (Start)
The absolute values of a(n) for n>=2 equal the q(n) sequence of the Eta triangle A160464.
(End)
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CROSSREFS
| Contribution from Johannes W. Meijer (meijgia(AT)hotmail.com), May 24 2009: (Start)
Cf. A160464 and A043529.
(End)
Sequence in context: A144477 A106345 A194636 * A080215 A060500 A187284
Adjacent sequences: A081726 A081727 A081728 * A081730 A081731 A081732
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KEYWORD
| sign,easy
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AUTHOR
| Ralf Stephan (ralf(AT)ark.in-berlin.de), Apr 06 2003
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