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6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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Continued fraction expansion of (15+sqrt(230))/5. [From Klaus Brockhaus, Apr 28 2010]
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LINKS
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Table of n, a(n) for n=1..56.
Index entries for sequences related to linear recurrences with constant coefficients, signature (0,1).
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FORMULA
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G.f.: 6x(1+5x)/((1-x)(1+x)). a(n)=6*A010686(n-1). [From Philippe DELEHAM, Sep 27 2009]
a(n)=18+12(-1)^n, with n>=1 [From Paolo P. Lava, Sep 28 2009]
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PROG
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(PARI) a(n)=30-n%2*24 \\ Charles R Greathouse IV, Jun 02 2011
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CROSSREFS
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Cf. A124886, A002445, A040214.
Sequence in context: A143563 A122802 A051685 * A123624 A066197 A078638
Adjacent sequences: A165731 A165732 A165733 * A165735 A165736 A165737
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KEYWORD
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nonn,easy
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AUTHOR
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Paul Curtz, Sep 25 2009
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EXTENSIONS
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Edited by N. J. A. Sloane, Sep 25 2009
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STATUS
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approved
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