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 A013724 a(n) = 19^(2*n + 1). 4
 19, 6859, 2476099, 893871739, 322687697779, 116490258898219, 42052983462257059, 15181127029874798299, 5480386857784802185939, 1978419655660313589123979, 714209495693373205673756419 (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 (361). FORMULA From Philippe Deléham, Nov 28 2008: (Start) a(n) = 361*a(n-1); a(0)=19. G.f.: 19/(1-361*x). (End) MAPLE seq(19^(2*n+1), n=0..10); # Nathaniel Johnston, Jun 25 2011 MATHEMATICA NestList[361#&, 19, 20] (* Harvey P. Dale, Jun 12 2017 *) PROG (MAGMA) [19^(2*n+1): n in [0..15]]; // Vincenzo Librandi, Jun 26 2011 (PARI) a(n)=19^(2*n+1) \\ Charles R Greathouse IV, Jul 11 2016 CROSSREFS Bisection of A001029. Cf. A013708-A013723, A013725-A013729. Sequence in context: A145214 A172662 A201303 * A067267 A124989 A265964 Adjacent sequences:  A013721 A013722 A013723 * A013725 A013726 A013727 KEYWORD nonn,easy AUTHOR STATUS approved

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Last modified October 23 07:05 EDT 2019. Contains 328335 sequences. (Running on oeis4.)