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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; internal format)
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OFFSET
| 0,1
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 0..500
Index entries for sequences related to linear recurrences with constant coefficients
Milan Janjic, Enumerative Formulas for Some Functions on Finite Sets
Tanya Khovanova, Recursive Sequences
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FORMULA
| a(n)=4*a(n-1), n>0 ; a(0)=9 . G.f.: 9/(1-4*x). [From Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Nov 23 2008]
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MATHEMATICA
| 9*4^Range[0, 100] (* From Vladimir Joseph Stephan Orlovsky, June 09 2011 *)
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PROG
| (MAGMA) [9*4^n: n in [0..30]]; // Vincenzo Librandi, May 19 2011
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CROSSREFS
| 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
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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