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

0,1

Links

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

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

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).

Mathematica

PadRight[{}, 100, {4, 6}] (* Paolo Xausa, Mar 23 2026 *)

Prog

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

Crossrefs

Cf. A010693.

Sequence in context: A091651 A199865 A196818 * A168428 A351126 A127018

Adjacent sequences: A010708 A010709 A010710 * A010712 A010713 A010714

Keyword

nonn,easy

Author

N. J. A. Sloane

Extensions

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

Status

approved