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9, 36, 144, 576, 2304, 9216, 36864, 147456, 589824, 2359296, 9437184, 37748736, 150994944, 603979776, 2415919104, 9663676416, 38654705664, 154618822656, 618475290624, 2473901162496, 9895604649984, 39582418599936, 158329674399744, 633318697598976
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,1
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LINKS
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Vincenzo Librandi, Table of n, a(n) for n = 0..500 Milan Janjic, Enumerative Formulas for Some Functions on Finite Sets
Tanya Khovanova, Recursive Sequences
Index to sequences with linear recurrences with constant coefficients, signature (4).
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FORMULA
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a(n)=4*a(n-1), n>0 ; a(0)=9 . G.f.: 9/(1-4*x). [From Philippe DELEHAM, Nov 23 2008]
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MATHEMATICA
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9*4^Range[0, 100] (* From Vladimir Joseph Stephan Orlovsky, June 09 2011 *)
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PROG
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(MAGMA) [9*4^n: n in [0..30]]; // Vincenzo Librandi, May 19 2011
(PARI) a(n)=9<<n \\ Charles R Greathouse IV, Apr 17 2012
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CROSSREFS
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Essentially the same as A055841. First differences of A002001.
Sequence in context: A188162 A023872 A034557 * A075674 A110752 A094973
Adjacent sequences: A002060 A002061 A002062 * A002064 A002065 A002066
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane.
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STATUS
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approved
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