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 A013720 a(n) = 15^(2*n + 1). 2
 15, 3375, 759375, 170859375, 38443359375, 8649755859375, 1946195068359375, 437893890380859375, 98526125335693359375, 22168378200531005859375, 4987885095119476318359375, 1122274146401882171630859375 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..200 Tanya Khovanova, Recursive Sequences Index entries for linear recurrences with constant coefficients, signature (225). FORMULA From Philippe Deléham, Nov 25 2008: (Start) a(n) = 225*a(n-1), a(0)=15. G.f.: 15/(1-225*x). (End) MAPLE seq(15^(2*n+1), n=0..11); # Nathaniel Johnston, Jun 25 2011 MATHEMATICA 15^(2Range[0, 12]+1)  (* Harvey P. Dale, Feb 09 2011 *) PROG (MAGMA) [15^(2*n+1): n in [0..15]]; // Vincenzo Librandi, Jun 26 2011 (PARI) a(n)=15^(2*n+1) \\ Charles R Greathouse IV, Jul 11 2016 CROSSREFS Bisection of A001024 (15^n). Sequence in context: A211903 A278630 A161584 * A230672 A145189 A182283 Adjacent sequences:  A013717 A013718 A013719 * A013721 A013722 A013723 KEYWORD nonn,easy AUTHOR STATUS approved

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Last modified October 23 07:11 EDT 2019. Contains 328336 sequences. (Running on oeis4.)