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A199677
8*9^n+1.
2
9, 73, 649, 5833, 52489, 472393, 4251529, 38263753, 344373769, 3099363913, 27894275209, 251048476873, 2259436291849, 20334926626633, 183014339639689, 1647129056757193, 14824161510814729, 133417453597332553, 1200757082375992969
OFFSET
0,1
FORMULA
a(n) = 9*a(n-1)-8.
a(n) = 10*a(n-1)-9*a(n-2).
G.f.: (9-17*x)/((1-x)*(1-9*x)).
MATHEMATICA
8*9^Range[0, 20]+1 (* or *) LinearRecurrence[{10, -9}, {9, 73}, 20] (* Harvey P. Dale, Nov 07 2013 *)
PROG
(Magma) [8*9^n+1: n in [0..30]];
CROSSREFS
Sequence in context: A365774 A086226 A338677 * A197676 A367977 A197534
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Nov 09 2011
STATUS
approved