OFFSET
0,2
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), n>1.
G.f.: (7*x+1)/(9*x^2-10*x+1). - Harvey P. Dale, Jan 01 2013
MATHEMATICA
2*9^Range[0, 30]-1 (* or *) LinearRecurrence[{10, -9}, {1, 17}, 30] (* Harvey P. Dale, Jan 01 2013 *)
PROG
(Magma) [2*9^n-1: n in [0..20]]
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Nov 01 2011
STATUS
approved