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Search: id:A005053
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| 1, 3, 15, 75, 375, 1875, 9375, 46875, 234375, 1171875, 5859375, 29296875, 146484375, 732421875, 3662109375, 18310546875, 91552734375, 457763671875, 2288818359375, 11444091796875, 57220458984375
(list; graph; listen)
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OFFSET
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0,2
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LINKS
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Milan Janjic, Enumerative Formulas for Some Functions on Finite Sets
INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 883
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FORMULA
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3*5^n.
Binomial transform of A122117 . - Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Oct 19 2006
a(0)=1, a(n)=3*5^(n-1) for n>=1 . - Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Oct 19 2006
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MAPLE
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with(finance):seq(ceil(futurevalue(3, 4, n)), n=-1..19); # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Mar 25 2009]
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CROSSREFS
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Sequence in context: A151326 A063000 A002902 this_sequence A136778 A000266 A059838
Adjacent sequences: A005050 A005051 A005052 this_sequence A005054 A005055 A005056
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KEYWORD
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nonn,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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