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A199754
a(n) = (5*11^n+1)/2.
1
3, 28, 303, 3328, 36603, 402628, 4428903, 48717928, 535897203, 5894869228, 64843561503, 713279176528, 7846070941803, 86306780359828, 949374583958103, 10443120423539128, 114874324658930403, 1263617571248234428
OFFSET
0,1
FORMULA
a(n) = 11*a(n-1)-5.
a(n) = 12*a(n-1)-11*a(n-2).
G.f.: (3-8*x)/((1-x)*(1-11*x)).
MATHEMATICA
(5 11^Range[0, 20]+1)/2 (* or *) LinearRecurrence[{12, -11}, {3, 28}, 20] (* Harvey P. Dale, Apr 12 2022 *)
PROG
(Magma) [(5*11^n+1)/2: n in [0..30]];
CROSSREFS
Sequence in context: A239297 A287884 A250890 * A277507 A176335 A072343
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Nov 10 2011
STATUS
approved