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A199022
5*11^n-1.
1
4, 54, 604, 6654, 73204, 805254, 8857804, 97435854, 1071794404, 11789738454, 129687123004, 1426558353054, 15692141883604, 172613560719654, 1898749167916204, 20886240847078254, 229748649317860804, 2527235142496468854
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.: (4 + 6*x)/(1 - 12*x + 11*x^2). - Vincenzo Librandi, Jan 04 2013
MATHEMATICA
CoefficientList[Series[(4 + 6*x)/(1 - 12*x + 11*x^2), {x, 0, 30}], x] (* Vincenzo Librandi, Jan 04 2013 *)
PROG
(Magma) [5*11^n-1 : n in [0..20]]
CROSSREFS
Sequence in context: A292305 A073863 A269480 * A221395 A357558 A241126
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Nov 02 2011
STATUS
approved