A010707 Period 2: repeat (3,9).

3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn
• easy

Comments

Continued fraction expansion of A176108. - R. J. Mathar, Mar 08 2012

Links

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

Programs

Mathematica

PadRight[{},120,{3,9}] (* Harvey P. Dale, Nov 07 2017 *)

PARI

a(n)=3+n%2*6 \\ Charles R Greathouse IV, Dec 21 2011

Formula

a(n) = -3*(-1)^n+6. - Paolo P. Lava, Oct 20 2006

G.f.: 3(1+3x)/((1-x)(1+x)). - R. J. Mathar, Nov 21 2011