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 A164559 a(n) = 6^n/3 - 1. 4
 1, 11, 71, 431, 2591, 15551, 93311, 559871, 3359231, 20155391, 120932351, 725594111, 4353564671, 26121388031, 156728328191, 940369969151, 5642219814911, 33853318889471, 203119913336831, 1218719480020991, 7312316880125951, 43873901280755711, 263243407684534271 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..600 Index entries for linear recurrences with constant coefficients, signature (7,-6). FORMULA a(n) = 6*a(n-1)+5 for n > 2; a(1) = 1, a(2) = 11. G.f.: x*(1+4*x)/((1-x)*(1-6*x)). PROG (Magma) [ 6^n/3-1: n in [1..20] ]; CROSSREFS Cf. A000400 (powers of 6), A024062 (6^n-1), A164560. Sequence in context: A268985 A211386 A049350 * A319535 A300541 A123362 Adjacent sequences: A164556 A164557 A164558 * A164560 A164561 A164562 KEYWORD nonn,easy AUTHOR Klaus Brockhaus, Aug 16 2009 STATUS approved

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Last modified June 19 00:22 EDT 2024. Contains 373492 sequences. (Running on oeis4.)