A010730 a(n) = (17 -3*(-1)^n)/2.

7, 10, 7, 10, 7, 10, 7, 10, 7, 10, 7, 10, 7, 10, 7, 10, 7, 10, 7, 10, 7, 10, 7, 10, 7, 10, 7, 10, 7, 10, 7, 10, 7, 10, 7, 10, 7, 10, 7, 10, 7, 10, 7, 10, 7, 10, 7, 10, 7, 10, 7, 10, 7, 10, 7, 10, 7, 10, 7, 10, 7, 10, 7, 10, 7, 10

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn

Comments

Period 2.

Links

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

Programs

Magma

&cat [[7, 10]^^50]; // Vincenzo Librandi, Feb 28 2020

Mathematica

PadRight[{},120,{7,10}] (* Harvey P. Dale, Jul 08 2019 *)

Formula

G.f.: ( -7-10*x ) / ( (x-1)*(1+x) ). - R. J. Mathar, Nov 21 2011

a(n) = 7 + 2^(1 - (-1)^n) - 1. - Vincenzo Librandi, Feb 28 2020