A013724 a(n) = 19^(2*n + 1).

19, 6859, 2476099, 893871739, 322687697779, 116490258898219, 42052983462257059, 15181127029874798299, 5480386857784802185939, 1978419655660313589123979, 714209495693373205673756419

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn
• easy

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).

Crossrefs

Bisection of A001029.

Cf. A013708-A013723, A013725-A013729.

Programs

Magma

[19^(2*n+1): n in [0..15]]; // Vincenzo Librandi, Jun 26 2011

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 *)

PARI

a(n)=19^(2*n+1) \\ Charles R Greathouse IV, Jul 11 2016

Formula

From Philippe Deléham, Nov 28 2008: (Start)

a(n) = 361*a(n-1); a(0)=19.

G.f.: 19/(1-361*x). (End)