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A199027
8*11^n-1.
1
7, 87, 967, 10647, 117127, 1288407, 14172487, 155897367, 1714871047, 18863581527, 207499396807, 2282493364887, 25107427013767, 276181697151447, 3037998668665927, 33417985355325207, 367597838908577287, 4043576227994350167
OFFSET
0,1
FORMULA
a(n) = 11*a(n-1)+10.
a(n) = 12*a(n-1)-11*a(n-2), n>1.
G.f.: (7 + 3*x)/(1 - 12*x + 11*x^2). - Vincenzo Librandi, Jan 04 2013
MATHEMATICA
CoefficientList[Series[(7 + 3*x)/(1 - 12*x + 11*x^2), {x, 0, 30}], x] (* Vincenzo Librandi, Jan 04 2013 *)
LinearRecurrence[{12, -11}, {7, 87}, 30] (* Harvey P. Dale, Jan 30 2013 *)
PROG
(Magma) [8*11^n-1 : n in [0..20]]
CROSSREFS
Sequence in context: A295036 A295527 A173812 * A360237 A279845 A231447
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Nov 02 2011
STATUS
approved