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A199750
2*11^n+1.
1
3, 23, 243, 2663, 29283, 322103, 3543123, 38974343, 428717763, 4715895383, 51874849203, 570623341223, 6276856753443, 69045424287863, 759499667166483, 8354496338831303, 91899459727144323, 1010894056998587543, 11119834626984462963
OFFSET
0,1
FORMULA
a(n) = 11*a(n-1)-10.
a(n) = 12*a(n-1)-11*a(n-2).
G.f.: (3-13*x)/((1-x)*(1-11*x)).
MATHEMATICA
2*11^Range[0, 20]+1 (* or *) LinearRecurrence[{12, -11}, {3, 23}, 20] (* Harvey P. Dale, Aug 14 2012 *)
PROG
(Magma) [2*11^n+1: n in [0..30]];
CROSSREFS
Sequence in context: A122009 A360987 A151433 * A318004 A098681 A118790
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Nov 10 2011
STATUS
approved