A013718 a(n) = 13^(2*n + 1).

13, 2197, 371293, 62748517, 10604499373, 1792160394037, 302875106592253, 51185893014090757, 8650415919381337933, 1461920290375446110677, 247064529073450392704413, 41753905413413116367045797

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 (169).

Crossrefs

Bisection of A001022 (12^n).

Cf. A013708-A013717, A013719-A013729.

Programs

Magma

[13^(2*n+1): n in [0..15]]; // Vincenzo Librandi, Jun 26 2011

Maple

seq(13^(2*n+1),n=0..11); # Nathaniel Johnston, Jun 25 2011

PARI

a(n)=13^(2*n+1) \\ Charles R Greathouse IV, Jul 11 2016

Formula

From Philippe Deléham, Nov 25 2008: (Start)

a(n) = 169*a(n-1); a(0)=13.

G.f.: 13/(1-169*x). (End)