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A013778 3^(4n+1). 1
3, 243, 19683, 1594323, 129140163, 10460353203, 847288609443, 68630377364883, 5559060566555523, 450283905890997363, 36472996377170786403, 2954312706550833698643, 239299329230617529590083, 19383245667680019896796723 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

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 (81).

FORMULA

a(n)=81*a(n-1), n>0 ; a(0)=3 . G.f.: 3/(1-81*x). [From Philippe Deléham, Nov 25 2008]

MATHEMATICA

3^(1 + 4Range[0, 15]) (* Harvey P. Dale, Jan 31 2011 *)

PROG

(MAGMA) [3^(4*n+1): n in [0..20]]; // Vincenzo Librandi, Jun 27 2011

(Maxima) makelist(3^(4*n+1), n, 0, 20); [Martin Ettl, Oct 21 2012]

CROSSREFS

Sequence in context: A024044 A069640 A236249 * A146313 A092799 A229690

Adjacent sequences:  A013775 A013776 A013777 * A013779 A013780 A013781

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified May 23 23:53 EDT 2017. Contains 286937 sequences.