OFFSET
0,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
Index entries for linear recurrences with constant coefficients, signature (8,-15).
FORMULA
From Mohammad K. Azarian, Jan 11 2009: (Start)
G.f.: 1/(1-3*x) + 1/(1-5*x).
E.g.f.: exp(3*x) + exp(5*x). (End)
a(n) = 8*a(n-1) - 15*a(n-2) with a(0)=2, a(1)=8. - Vincenzo Librandi, Jul 21 2010
a(n) = 2*A081186(n). - R. J. Mathar, Mar 10 2022
MATHEMATICA
Table[3^n + 5^n, {n, 0, 25}]
PROG
(Magma) [3^n + 5^n: n in [0..35]]; // Vincenzo Librandi, Apr 30 2011
(PARI) a(n)=3^n+5^n \\ Charles R Greathouse IV, Sep 28 2015
(SageMath) [3^n+5^n for n in range(41)] # G. C. Greubel, Jan 14 2024
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Robert G. Wilson v, Aug 25 2002
STATUS
approved