OFFSET
0,2
LINKS
FORMULA
a(n)=(-5)*a(n-1)+10 with a(0)=1. a(0)=1, a(1)=5, a(n)=5*a(n-2)-4*a(n-1). G.f.: (1+9x)/(1+4x-5x^2). a(n)= Sum_{k, 0<=k<=n} A112555(n,k)*4^(n-k).
MATHEMATICA
LinearRecurrence[{-4, 5}, {1, 5}, 30] (* Harvey P. Dale, Nov 28 2015 *)
CROSSREFS
KEYWORD
easy,sign
AUTHOR
Philippe Deléham, Sep 22 2009
STATUS
approved