OFFSET
0,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (10,-9).
FORMULA
a(n) = 9*a(n-1)-8.
a(n) = 10*a(n-1)-9*a(n-2).
G.f.: (7-15*x)/((1-x)*(1-9*x)).
MATHEMATICA
6*9^Range[0, 20]+1 (* or *) LinearRecurrence[{10, -9}, {7, 55}, 20] (* Harvey P. Dale, Apr 16 2014 *)
PROG
(Magma) [6*9^n+1: n in [0..30]];
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Nov 08 2011
STATUS
approved