A010711 Period 2: repeat (4,6).

4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 4

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn
• easy

Links

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

Programs

PARI

a(n)=n%2*2+4 \\ Charles R Greathouse IV, Jun 11 2015

Formula

a(n)=-(-1)^n+5. Paolo P. Lava, Oct 20 2006

G.f.: -2*(2+3*x)/((x-1)*(1+x)).

a(n) = 2*A010693(n).

Extensions

First formula corrected by Paolo P. Lava, Mar 14 2011