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A199678
10*9^n+1.
1
11, 91, 811, 7291, 65611, 590491, 5314411, 47829691, 430467211, 3874204891, 34867844011, 313810596091, 2824295364811, 25418658283291, 228767924549611, 2058911320946491, 18530201888518411, 166771816996665691, 1500946352969991211
OFFSET
0,1
FORMULA
a(n) = 9*a(n-1)-8.
a(n) = 10*a(n-1)-9*a(n-2).
G.f.: (11-19*x)/((1-x)*(1-9*x)).
PROG
(Magma) [10*9^n+1: n in [0..30]];
CROSSREFS
Sequence in context: A245599 A126532 A226868 * A377943 A201549 A117611
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Nov 09 2011
STATUS
approved