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A013720
a(n) = 15^(2*n + 1).
2
15, 3375, 759375, 170859375, 38443359375, 8649755859375, 1946195068359375, 437893890380859375, 98526125335693359375, 22168378200531005859375, 4987885095119476318359375, 1122274146401882171630859375
OFFSET
0,1
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
KEYWORD
nonn,easy
STATUS
approved