A010678 Period 2: repeat (0,7).

0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0, 7, 0

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn
• easy

Links

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

Programs

Mathematica

PadRight[{},120,{0,7}] (* Harvey P. Dale, Oct 01 2013 *)

PARI

a(n)=n%2*7 \\ Charles R Greathouse IV, Jul 13 2016

Formula

a(n) = (7/2)*[1-(-1)^n] = 7*(n mod 2). - Paolo P. Lava, Oct 20 2006

G.f.: 7x/((1-x)(1+x)). - R. J. Mathar, Nov 21 2011