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<a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (8,-15).
E.g.f.: e^exp(3*x) + e^exp(5*x). (End)
(SageMath) [3^n+5^n for n in range(41)] # G. C. Greubel, Jan 14 2024
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(MAGMAMagma) [3^n + 5^n: n in [0..35]]; // Vincenzo Librandi, Apr 30 2011
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a(n) = 2*A081186(n). - R. J. Mathar, Mar 10 2022
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a(n) = 3^n + 5^n.
From Mohammad K. Azarian, Jan 11 2009: (Start)
G.f.: 1/(1-3*x) + 1/(1-5*x). E.g.f.: e^(3*x)+e^(5*x). - _Mohammad K. Azarian_, Jan 11 2009
E.g.f.: e^(3*x) + e^(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
(MAGMA) [3^n + 5^n: n in [0..35]]; // _Vincenzo Librandi, _, Apr 30 2011
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