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A199029
a(n) = 9*11^n-1.
1
8, 98, 1088, 11978, 131768, 1449458, 15944048, 175384538, 1929229928, 21221529218, 233436821408, 2567805035498, 28245855390488, 310704409295378, 3417748502249168, 37595233524740858, 413547568772149448, 4549023256493643938
OFFSET
0,1
FORMULA
a(n) = 11*a(n-1)+10.
a(n) = 12*a(n-1)-11*a(n-2).
G.f.: 2*(4+x)/((1-x)*(1-11*x)). a(n) = 2*A199028(n). - Bruno Berselli, Nov 03 2011
PROG
(Magma) [9*11^n-1: n in [0..20]];
CROSSREFS
Cf. A199028.
Sequence in context: A290242 A116229 A099150 * A228329 A228794 A366035
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Nov 03 2011
STATUS
approved