OFFSET
0,2
LINKS
FORMULA
a(n) = A047848(2,n).
From Philippe Deléham, Oct 06 2009: (Start)
a(n) = 6*a(n-1) - 5*a(n-2) for n > 1.
G.f.: (1-4*x)/((1-x)*(1-5*x)). (End)
a(n) = 5*a(n-1) - 3 (with a(0)=1). - Vincenzo Librandi, Aug 06 2010
From Elmo R. Oliveira, Dec 10 2023: (Start)
a(n) = A132079(n)/2.
E.g.f.: (1/4)*(exp(5*x) + 3*exp(x)). (End)
PROG
(PARI) a(n)=(5^n+3)/4 \\ Charles R Greathouse IV, Oct 07 2015
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
EXTENSIONS
Better description from Michael Somos
STATUS
approved