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A013718
a(n) = 13^(2*n + 1).
4
13, 2197, 371293, 62748517, 10604499373, 1792160394037, 302875106592253, 51185893014090757, 8650415919381337933, 1461920290375446110677, 247064529073450392704413, 41753905413413116367045797
OFFSET
0,1
FORMULA
From Philippe Deléham, Nov 25 2008: (Start)
a(n) = 169*a(n-1); a(0)=13.
G.f.: 13/(1-169*x). (End)
MAPLE
seq(13^(2*n+1), n=0..11); # Nathaniel Johnston, Jun 25 2011
PROG
(Magma) [13^(2*n+1): n in [0..15]]; // Vincenzo Librandi, Jun 26 2011
(PARI) a(n)=13^(2*n+1) \\ Charles R Greathouse IV, Jul 11 2016
CROSSREFS
Bisection of A001022 (12^n).
Sequence in context: A325216 A161588 A221927 * A145187 A221896 A209468
KEYWORD
nonn,easy
STATUS
approved