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 A198966 a(n) = 8*9^n-1. 3
 7, 71, 647, 5831, 52487, 472391, 4251527, 38263751, 344373767, 3099363911, 27894275207, 251048476871, 2259436291847, 20334926626631, 183014339639687, 1647129056757191, 14824161510814727, 133417453597332551, 1200757082375992967 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..1000 Index entries for linear recurrences with constant coefficients, signature (10,-9). FORMULA a(n) = 9*a(n-1)+8. a(n) = 10*a(n-1)-9*a(n-2), n>1. G.f.: (7 + x)/(1 - 10*x + 9*x^2). - Vincenzo Librandi, Jan 03 2013 MATHEMATICA CoefficientList[Series[(7 + x)/(1 - 10*x + 9*x^2), {x, 0, 30}], x] (* Vincenzo Librandi, Jan 03 2013 *) PROG (Magma) [8*9^n-1: n in [0..20]] (PARI) a(n) = 8*9^n - 1; \\ Michel Marcus, Feb 03 2016 CROSSREFS Sequence in context: A196742 A196900 A319963 * A069591 A039920 A100895 Adjacent sequences: A198963 A198964 A198965 * A198967 A198968 A198969 KEYWORD nonn,easy AUTHOR Vincenzo Librandi, Nov 01 2011 STATUS approved

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Last modified March 29 22:15 EDT 2023. Contains 361599 sequences. (Running on oeis4.)