A165734 Period 2: repeat (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, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30, 6, 30

Offset

1,1

Comments

Continued fraction expansion of (15 + sqrt(230))/5 = A176906. - Klaus Brockhaus, Apr 28 2010

Links

Table of n, a(n) for n=1..72.

Index entries for linear recurrences with constant coefficients, signature (0,1).

Formula

From Philippe Deléham, Sep 27 2009: (Start)

G.f.: 6*x*(1+5*x)/((1-x)*(1+x)).

a(n) = 6*A010686(n-1). (End)

From Elmo R. Oliveira, Oct 13 2025: (Start)

E.g.f.: 6*(5*cosh(x) + sinh(x) - 5).

a(n) = 6*(3 + 2*(-1)^n).

a(n) = 3*A010700(n-1). (End)

Mathematica

PadRight[{}, 120, {6, 30}] (* Harvey P. Dale, Jun 03 2019 *)

Prog

(PARI) a(n)=30-n%2*24 \\ Charles R Greathouse IV, Jun 02 2011

Crossrefs

Cf. A002445, A010686, A010700, A040214, A124886, A176906.

Sequence in context: A144746 A051685 A326858 * A367665 A309253 A260017

Adjacent sequences: A165731 A165732 A165733 * A165735 A165736 A165737

Keyword

nonn,easy

Author

Paul Curtz, Sep 25 2009

Extensions

Edited by N. J. A. Sloane, Sep 25 2009

Status

approved