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A165734 Period 2: repeat 6,30. 7

%I

%S 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,

%T 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,

%U 6,30

%N Period 2: repeat 6,30.

%C Continued fraction expansion of (15+sqrt(230))/5. [From _Klaus Brockhaus_, Apr 28 2010]

%H <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (0,1).

%F G.f.: 6x(1+5x)/((1-x)(1+x)). a(n)=6*A010686(n-1). [From _Philippe Deléham_, Sep 27 2009]

%F a(n)=18+12(-1)^n, with n>=1 [From _Paolo P. Lava_, Sep 28 2009]

%t PadRight[{},120,{6,30}] (* _Harvey P. Dale_, Jun 03 2019 *)

%o (PARI) a(n)=30-n%2*24 \\ _Charles R Greathouse IV_, Jun 02 2011

%Y Cf. A124886, A002445, A040214.

%K nonn,easy

%O 1,1

%A _Paul Curtz_, Sep 25 2009

%E Edited by _N. J. A. Sloane_, Sep 25 2009

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Last modified July 16 00:52 EDT 2019. Contains 325061 sequences. (Running on oeis4.)