A013790 a(n) = 9^(4*n + 1).
9, 59049, 387420489, 2541865828329, 16677181699666569, 109418989131512359209, 717897987691852588770249, 4710128697246244834921603689, 30903154382632612361920641803529, 202755595904452569706561330872953769
Offset: 0
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 (6561).
Programs
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Magma
[9^(4*n+1): n in [0..15]]; // Vincenzo Librandi, Jun 28 2011
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Maxima
makelist(9^(4*n+1),n,0,20); /* Martin Ettl, Oct 21 2012 */
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PARI
a(n)=9^(4*n+1) \\ Charles R Greathouse IV, Jul 11 2016
Formula
From Philippe Deléham, Dec 07 2008: (Start)
a(n) = 6561*a(n-1); a(0)=9.
G.f.: 9/(1-6561*x).
a(n) = A013791(n)/81. (End)