A010729 a(n) = 8 - (-1)^n.

7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7

Offset

0,1

Links

Table of n, a(n) for n=0..80.

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

Formula

Period 2.

a(n+1) = A173512(n+1) - A173512(n). - Reinhard Zumkeller, Feb 20 2010

G.f.: ( -7-9*x ) / ( (x-1)*(1+x) ). - R. J. Mathar, Nov 20 2011

E.g.f.: 7*cosh(x) + 9*sinh(x). - Stefano Spezia, Sep 27 2023

Mathematica

PadRight[{}, 100, {7, 9}] (* Harvey P. Dale, May 09 2012 *)

Prog

(PARI) a(n)=8-(-1)^n \\ Charles R Greathouse IV, Jun 11 2015

Crossrefs

Sequence in context: A199742 A258112 A076668 * A340220 A182688 A342571

Adjacent sequences: A010726 A010727 A010728 * A010730 A010731 A010732

Keyword

nonn,easy

Author

N. J. A. Sloane

Status

approved