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 A013712 a(n) = 7^(2*n + 1). 3
 7, 343, 16807, 823543, 40353607, 1977326743, 96889010407, 4747561509943, 232630513987207, 11398895185373143, 558545864083284007, 27368747340080916343, 1341068619663964900807, 65712362363534280139543, 3219905755813179726837607, 157775382034845806615042743 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..150 Tanya Khovanova, Recursive Sequences Index entries for linear recurrences with constant coefficients, signature (49). FORMULA From Philippe Deléham, Nov 24 2008: (Start) a(n) = 49*a(n-1); a(0)=7. G.f.: 7/(1-49*x). a(n) = 7*A087752(n). (End) From Elmo R. Oliveira, Aug 27 2024: (Start) E.g.f.: 7*exp(49*x). a(n) = A000420(A005408(n)). (End) MATHEMATICA NestList[49#&, 7, 20] (* Harvey P. Dale, Jul 15 2019 *) PROG (Magma) [7^(2*n+1): n in [0..20]]; // Vincenzo Librandi, May 26 2011 (PARI) a(n)=7^(2*n+1) \\ Charles R Greathouse IV, Jul 11 2016 CROSSREFS Cf. A000420, A005408, A087752. Sequence in context: A263220 A145252 A154024 * A109493 A193614 A194504 Adjacent sequences: A013709 A013710 A013711 * A013713 A013714 A013715 KEYWORD nonn,easy AUTHOR N. J. A. Sloane STATUS approved

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Last modified September 10 21:37 EDT 2024. Contains 375795 sequences. (Running on oeis4.)